The Battle of Shiloh, also known as the Battle of Pittsburg Landing, was a major battle in the American Civil War fought on April 6–7, 1862. The fighting took place in southwestern Tennessee, which was part of the war's western theater. The battlefield is located between a small, undistinguished church named Shiloh and Pittsburg Landing on the Tennessee River. Two Union armies combined to defeat the Confederate Army of Mississippi. Major General Ulysses S. Grant was the Union commander, while General Albert Sidney Johnston was the Confederate commander until his battlefield death, when he was replaced by his second-in-command, General P. G. T. Beauregard. The Confederate army hoped to defeat Grant's Army of the Tennessee before it could be reinforced and resupplied. Although it made considerable gains with a surprise attack on the first day of the battle, Johnston was mortally wounded and Grant's army was not eliminated. Overnight, Grant's Army of the Tennessee was reinforced by one of its divisions stationed farther north, and was also joined by portions of the Army of the Ohio, under the command of Major General Don Carlos Buell. The Union forces conducted an unexpected counterattack in the morning, which reversed the Confederate gains of the previous day. The exhausted Confederate army withdrew further south, and a modest Union pursuit started and ended on the next day. Though victorious, the Union army had around 2,500 more casualties than the Confederates (mostly a difference in the number captured). After the lengthy Union casualty list became known, Grant was heavily criticized; decisions made by both the Federal and Confederate high command were afterward questioned by individuals on and off the battlefield. The battle was the costliest engagement of the Civil War up to that point, and its nearly 24,000 casualties made it one of the bloodiest battles of the entire war.
Background and plans
During February 1862, a Union army led by Ulysses S. Grant won two battles that were the most significant Union victories, at that time, of the American Civil War. The battles were the Battle of Fort Henry and the Battle of Fort Donelson, and they occurred in Tennessee on the Tennessee River and the Cumberland River, respectively. Those rivers were vital to the Confederacy as transportation routes, and also connected the city of Nashville, an ironworks, and major agricultural areas. Nashville was a converging point for railroads, a major producer of gunpowder, and a major supply depot. The Union army increased its firepower in those battles by receiving assistance from U.S. Navy gunboats. The steam-powered gunboats were flat-bottomed, armored, and carried up to 13 artillery pieces. Grant was rewarded for his success by a promotion to major general, making him senior to all generals in the western theater (between the Appalachian Mountains and Mississippi River) with the exception of Major General Henry Halleck. Continuing their push into Confederate territory, Union troops arrived at the Tennessee River town of Savannah, Tennessee, on March 11. By mid-March, a large number of Union troops were camped there and at landings further south, and additional Union troops under the command of Don Carlos Buell were moving from Nashville to join the force on the river. Union leadership realized that its troops were too spread out, so it was decided to concentrate troops at Pittsburg Landing. Pittsburg Landing is nine miles (14 km) upriver (south) of Savannah, and it had a road that led to Corinth, Mississippi. About three miles (4.8 km) inland from the landing was a log church named Shiloh (a Hebrew word meaning "place of peace"), and it is from this church that the battle gets its name. The battle has also been called the Battle of Pittsburg Landing. The area that would become the Shiloh battlefield was somewhat shaped like a triangle, with the sides formed by various creeks and the Tennessee River. The land was mostly wooded, with scattered cotton fields, peach orchards, and a few small structures. The Confederate Army's February 6 casualties at Fort Henry caused it to abandon Kentucky and parts of Tennessee. The last Confederate troops in Nashville moved south on February 23. General Albert Sidney Johnston, Confederate commander of the western theater, made the controversial decision to abandon the region. Although Confederate politicians were unhappy with Johnston's performance and the abandonment, the consolidation of troops further south was a wise choice, because the Union forces on the Tennessee River could cut off Confederate retreats from posts in Kentucky and major portions of Tennessee. Confederate leadership decided to consolidate forces in Corinth, Mississippi, which is just south of the Tennessee–Mississippi border. The town of Corinth had strategic value because it was at the intersection of two railroads, including one that was part of the rail network used to move Confederate supplies and troops between Tennessee and Virginia. By the end of March, over 40,000 Confederate troops were concentrated at Corinth.
Union and Confederate plans
The Union plan was to combine Grant's and Buell's armies and continue its southward offensive. If the combined armies could move south and capture Corinth, they would have a good starting point for the capture of Memphis, Vicksburg, and large portions of Confederate territory. While most of Grant's army camped near the river at Pittsburg Landing in early April, one division was five miles (8.0 km) downstream (north) at Crump's Landing, and army headquarters remained further north in Savannah. Buell's army was moving south from Nashville to Savannah, and no advancement beyond the Pittsburg Landing-Shiloh area was allowed until the two armies combined. On April 4, Confederate cavalry was seen by a Union patrol near Shiloh, but Union leadership was not concerned. Confederate leaders realized they could soon be outnumbered. They had 42,000 men at Corinth, and 15,000 more on the way, while the not–yet–combined Union force could be as large as 75,000 men. Instead of waiting to be attacked by a larger force, they decided to surprise the Union Army on April 4 before the second Union Army arrived from Nashville. Inexperience and bad weather caused their 20-mile (32 km) march north to be "a nightmare of confusion and delays", and the Confederate Army was not deployed into position until the afternoon of April 5. The army spent the night of April 5 on the south side of the Union campsites. The plan was to attack the Union left, pushing it northwest against the swampy land adjacent to Snake and Owl creeks. Confederate troops along the Tennessee River would prevent Union reinforcements and resupply.
Opposing forces
Union
The two Union armies in the Battle of Shiloh were part of the Department of the Mississippi, which was commanded by Major General Henry Halleck. Although Halleck hoped to lead the two armies in an eventual attack on Corinth, he was not present at Shiloh. The combined armies present for the battle totaled to 66,812 men. They had 119 artillery pieces available for the battle. The majority of the Union soldiers were armed with either a .69 caliber model 1841 rifled musket or a .69 caliber model 1842 smoothbore musket, although a few regiments had more modern weapons such as the .58 caliber Springfield Model 1855. A few regiments, or sometimes a few companies within a regiment, had British Enfield or Austrian Lorenz rifles. The armies and their divisions were organized as follows:
Army of the Tennessee
The Army of the Tennessee had the most Union men present at the battle, and it was commanded by Major General Ulysses S. Grant. In February 1862, a smaller version of Grant's army, with the assistance of gunboats under the command of Flag-Officer Andrew H. Foote, had been the victor in the Battle of Fort Henry and the Battle of Fort Donelson. For the Battle of Shiloh, Grant's army had 48,894 men in six divisions. Two new divisions (4th and 5th) were added to Grant's three in early March. A 6th Division was created from reinforcement units at the beginning of April. The divisions (and gunboats) were as follows:
1st Division was commanded by Major General John Alexander McClernand. This division consisted of veteran fighters. 2nd Division was commanded by Brigadier General William H. L. Wallace. His men were veterans, but Wallace had been newly appointed commander after an injury to Major General Charles F. Smith. Colonel James M. Tuttle, one of the brigade commanders, would eventually lead this division. 3rd Division was commanded by Major General Lew Wallace. Many of the men in this division were veteran fighters. 4th Division was commanded by Brigadier General Stephen A. Hurlbut. This division contained a mixture of veterans and new soldiers. 5th Division was commanded by Brigadier General William Tecumseh Sherman. This division had little combat experience. However, when the attack at Shiloh began, Sherman was the only Union division commander on the battlefield who had been trained at the United States Military Academy (a.k.a. West Point). 6th Division was commanded by Brigadier General Benjamin M. Prentiss. This division did not have much combat experience. Two U.S. Navy gunboats were used by Grant in the battle. These boats were timberclads—their armor was five inches (13 cm) thick oak wood. The USS Tyler was commanded by Lieutenant William Gwin. The USS Lexington was commanded by Lieutenant James W. Shirk. Both boats and their commanders had participated in the Battle of Fort Henry and the Battle of Fort Donelson.
Army of the Ohio
The other Union army at the Battle of Shiloh was the Army of the Ohio, which was commanded by Major General Don Carlos Buell. Portions of this army did not participate in the battle. One portion remained in Nashville, and another portion moved toward Murfreesboro and northern Alabama. Another division, plus part of a second one, did not arrive in time to participate in the battle. The number of men present at the battle totaled to 17,918. Although none of the regiments in Buell's army had participated in a major battle, all were well-trained and well-equipped. The divisions in the battle were:
2nd Division was commanded by Brigadier General Alexander McDowell McCook. 4th Division was commanded by Brigadier General William "Bull" Nelson. 5th Division was commanded by Brigadier General Thomas L. Crittenden. 6th Division was commanded by Brigadier General Thomas J. Wood. Only his brigades commanded by Brigadier General James A. Garfield and Colonel George D. Wagner arrived in time for the battle, and they were in place around 2:00 pm on the second day. The 57th Indiana Infantry Regiment was detached from Wagner's brigade to Hurlbut's division (Grant), and it was the only regiment to engage with the enemy and receive casualties.
Confederate
The Confederate army at the Battle of Shiloh was the Army of Mississippi, commanded by General Albert Sidney Johnston, with General Pierre G. T. Beauregard as Johnston's second in command. Created by combining the scattered divisions of Johnston's army with troops from Mobile and New Orleans, and later including one regiment that arrived on April 7, Johnston's army had 44,699 men present for duty. The army also had 117 artillery pieces for the battle. The forces at the battle were:
First Corps was commanded by Major General Leonidas Polk, and consisted of two divisions. Second Corps was commanded by Major General Braxton Bragg, and consisted of two divisions. Although lacking experience in combat, Bragg's troops were the best drilled and disciplined Confederate troops at the battle. Third Corps was commanded by Major General William J. Hardee, and consisted of three brigades. Reserve Corps was commanded by Brigadier General John C. Breckinridge, and consisted of three brigades. In addition to the three brigades, this corps included some cavalry regiments and batteries that were not assigned to a brigade. An unassigned infantry force was the 47th Tennessee Infantry Regiment, which arrived at the battle on April 7. Most of the Confederate troops did not have combat experience, and regiments were smaller than normal. Bragg's Second Corps was the largest of four corps, although it was smaller than the normal size. One of the reasons for the four small corps (instead of fewer corps that were larger) was size deception, as a typical corps had about 20,000 men. Small arms included flintlocks, shotguns, squirrel rifles, and percussion muskets. A few thousand of the highly accurate Enfield rifles had been distributed to Johnston's men before the battle; the supply of these increased as they were seized from Union troops in combat. Only one-third of the cavalry possessed any weapons at the start of the battle. Confederate cavalry was much more effective than their Union counterpart, and enabled Johnston to know the positions of both Union armies.
Battle, morning of April 6
Early morning
Early Sunday morning on April 6, five of Grant's six divisions were camped between the Shiloh Church area and the Tennessee River. Sherman's division was the first to occupy the Shiloh area, so his four brigades were camped near the main approaches to Pittsburg Landing. Colonel David Stuart's brigade was on the Union left (east side of battlefield) near the Hamburg-Savannah Road and a ford. To the west in the Shiloh Church area, Sherman's other three brigades formed the Union right. They covered the Pittsburg–Corinth Road and the Owl Creek Bridge over the Hamburg–Purdy Road. In between Sherman and Stuart was Prentiss's division, and between the Shiloh Church area and the Tennessee River were the divisions of McClernand and Hurlbut. To the north and closest to Pittsburg Landing was W.H.L. Wallace's division. Lew Wallace's division was at Crump's Landing, five miles (8.0 km) downstream (north) of the Union campsites. His mid-March mission had been to damage a railroad. While on this railroad raid, his men learned that a large Confederate force was nearby. Because of this Confederate force, Wallace's division remained near Crump's Landing. Grant was further north at his headquarters in Savannah. Nelson's division from Buell's army had reached Savannah, but Buell's other divisions were still marching. The Shiloh camps did not form a defensive line, and no entrenchments were made because nobody expected a fight at that location. The inexperienced divisions of Sherman and Prentiss were the most forward (closest to Corinth) of the group. Only a few pickets were in place—despite a small skirmish taking place on April 4. After hearing reports concerning sightings of Confederate soldiers in the Shiloh area, Colonel Everett Peabody, commander of the First Brigade from Prentiss's division, became concerned. Around midnight on April 5, Peabody ordered Major James E. Powell to take three companies of the 25th Missouri Infantry Regiment, and two companies of the 12th Michigan Infantry Regiment, on a reconnaissance (a.k.a. scout) to Seay Field where the sighting had been made. Prentiss was not informed, and Powell's men advanced from their camp southwest down a farm road that led to the Pittsburg-Corinth Road. It has been reported that contemporary Confederate soldiers at Shiloh referred to the brilliant sunrise on the day as the "Sun of Austerlitz," drawing a comparison to Napoleon's renowned sunrise at Austerlitz. This phrase is noted in several subsequent accounts derived from the recollections of those who participated.
Fighting starts at Fraley Field
The Confederate Third Brigade of Hardee's Third Corps was southwest of Powell's patrol. The brigade was commanded by Brigadier General S. A. M. Wood, and he had sent forward 280 skirmishers from Major Aaron B. Hardcastle's Third Mississippi Battalion. Hardcastle kept most of his men in the southeast corner of James J. Fraley's 40-acre (16 ha) cotton field, while two sets of pickets were positioned closer to the Union camps. Around 5:00 am (April 6), Confederate pickets fired at Powell's men before returning to the battalion. When Powell advanced within 200 yards (180 m) of Hardcastle's main force, the Confederates opened fire. The battle began with these two small forces fighting for over an hour. Around 5:30 am, Confederate leaders heard the commotion at Fraley Field, and Johnston ordered a general attack. Johnston instructed Beauregard to stay in the rear and direct men and supplies as needed. Johnston rode to the front to lead the men on the battle line, and this arrangement effectively ceded control of the battle to Beauregard. On the Union side, Powell sent a message to Colonel Peabody that he was being driven back by an enemy force of several thousand. Hearing the fighting, Prentiss soon learned that Peabody had sent out a patrol without authorization. Prentiss was outraged and accused Peabody of provoking a major engagement in violation of Grant's orders. However, he soon understood that he was facing a large Confederate force and sent reinforcements. Peabody's patrol, with Powell leading, partially ruined the planned Confederate surprise and gave thousands of Union soldiers time (although brief) to prepare for battle. Although Peabody's patrol had alerted the Union army, some Union leaders were not convinced that they were under attack. Sherman was not convinced until he was slightly wounded, and one of his orderlies shot dead, after a 7:00 am ride to investigate the commotion near Rea Field. After Johnston's 5:30 order for a general attack, it took an hour before all Confederate troops were ready. Another hour was lost skirmishing at Seay Field (close to Fraley Field). This reduced the Confederate advantage from the unexpected attack. The Confederate army alignment was another issue that helped reduce the attack's effectiveness. The corps of Hardee and Bragg began the assault with their divisions in one line that was nearly 3 miles (4.8 km) wide. At about 7:30 am Beauregard ordered the corps of Polk and Breckinridge forward on the left and right of the line, which only extended the line and diluted the effectiveness of the two attacking corps. It became impossible to control the intermingled units, so the corps commanders decided to divide the battlefield, and each commander led their battlefield portion instead of their own corps. The attack went forward as a frontal assault. Johnston and Beauregard did not put more strength on the east side, which meant they did not focus on their objective of turning the Union left.
Sherman and Prentiss
Sherman and Prentiss were the commanders of the first two Union divisions attacked, and those happened to be the most inexperienced of Grant's six divisions. Sherman, who had been negligent in preparing for an attack, performed with "coolness and courage" while he inspired his raw troops. Facing artillery fire and a frontal attack from the corps of Hardee, Bragg, and Polk, Sherman's men performed reasonably well—if they fought. The inexperienced colonel of the 53rd Ohio Infantry Regiment, which had just repelled two Confederate advances, yelled "retreat and save yourselves", and many from his regiment ran away. Eventually, at least two companies of the calmer men from this regiment attached to another regiment. Sherman slowly moved the division back to a position behind Shiloh Church. He became supported on his left by the Third Brigade from McClernand's division. Prentiss had his camps northeast of Seay Field. On his right, his brigade commanded by Peabody was attacked by two Confederate brigades, and Peabody was wounded four times before being killed. By 8:30 am, the remnants of Peabody's brigade were pushed north, and the Confederate army occupied his camp. Further east, Prentiss's other brigade was attacked by brigades commanded by Brigadier General Adley H. Gladden and Brigadier General James R. Chalmers. Around 8:45 am, Gladden was mortally wounded from cannon fire. The Confederate troops suffered considerable casualties, especially from artillery fire. However, the Confederate troops pushed on, and captured the remaining 6th Division camp sometime near 9:00 am. The Confederate soldiers had seen many of the Union soldiers running away from the front line, and now possessed the Union camps of Sherman and Prentiss. Looting became a problem, as Confederate soldiers found clothing, rifles, and food. Confederate leaders found it difficult to control their forces. They paused their attack, which enabled Prentiss to move further north. East of McClernand, Hurlbut had all three brigades ready for action at 8:00 am. After being notified that Sherman was facing a strong attack on his left, Hurlbut sent his Second Brigade, commanded by Colonel James C. Veatch, to assist Sherman. Shortly after that first message, Hurlbut was advised that Prentiss was in trouble. Hurlbut brought his remaining two brigades south on the Hamburg-Savannah Road near Wicker Field, and he encountered a large number of panic-stricken men from Prentiss's division who were fleeing north. Unable to stop the retreat, he settled his brigades further south near a peach orchard.
Pittsburg Landing and the Union left
Grant was in Savannah having breakfast at his Cherry Mansion headquarters when he heard the distant sounds of artillery fire. He was on crutches as he recovered from a fall from his horse, and he was waiting for more of Buell's army to arrive in Savannah. Grant ordered Bull Nelson to march his division along the east side of the river to a point opposite Pittsburg Landing, where it could be ferried over to the battlefield. Grant then took his steamboat, Tigress, south to Crump's Landing, where he told Lew Wallace to get his division ready to move. Grant proceeded to Pittsburg Landing, arriving around 9:00 am. The landing was beginning to accumulate men who had fled their posts, and Grant ordered a colonel to halt all stragglers. He then rode inland and confirmed that the Confederates had launched a full-scale attack instead of a probing action. He sent a message to Crump's Landing, ordering Lew Wallace to bring his division to the battlefield. After the beginning of the battle, Brigadier General W.H.L. Wallace sent his Second Brigade, commanded by Brigadier General John McArthur, to fill a gap on the Union left between Hurlbut's position at a peach orchard and Stuart's brigade at the extreme Union left. McArthur had only two of his regiments, since the others had been sent to assist Sherman and guard the Snake River bridge that led to Crump's Landing. His two–regiment force was bolstered by Battery A from the 1st Illinois Light Artillery Regiment. Wallace's First and Third brigades, commanded by Colonel James M. Tuttle and Colonel Thomas W. Sweeny, respectively, moved into positions near Duncan Field and what is now called the "Sunken Road"—between the divisions of McClernand and Hurlbut. From 9:30 am to 10:30 am, most of the fighting at this position was the exchange of artillery fire. On the extreme Union left, Stuart's brigade had heard musket firing early in the morning, but did not believe they were under attack until they heard distant artillery fire. At 9:30 am Johnston received reports that Union soldiers were deploying on the Confederate right flank. To remedy this potential problem, he sent two brigades from Bragg's Corps, and called up Breckinridge's Reserve Corps. What his scouts had actually found was the camp belonging to Stuart's Brigade. Stuart was near the Hamburg-Savannah Road close to Lick Creek. Around 9:40 am Stuart began receiving artillery fire, and twenty minutes later his men were attacked by Confederate infantry.
Crossroads
Shortly after 10:00 am, the remnants of Sherman's division established a new position further north from Shiloh Church. This position was near a crossroads of the Hamburg–Purdy Road with the Pittsburg–Corinth Road. By this time, Sherman's Third Brigade (three Ohio regiments) was eliminated, as its last intact regiment ran away. Colonel Jesse Hildebrand, the brigade commander, remained on the field as a volunteer aide for McClernand's headquarters. Sherman's First Brigade, commanded by Colonel John A. McDowell was west on the Hamburg–Purdy Road and cut off. Colonel Ralph P. Buckland's Fourth Brigade was fragmented and ammunition was low. Sherman prepared a defense with the men he had left, including Colonel Julius Raith's Third Brigade from McClernand's division that had reinforced Sherman's left earlier. Sherman also had the 6th Indiana Artillery Battery commanded by Captain Frederick Behr, and part of a battery from McClernand. For the first time, the Union army had a continuous front. From west to east were the remnants of Sherman's division, McClernand, W.H.L. Wallace, the remnants of Prentiss's division, Hurlbut, McArthur's brigade from W.H.L. Wallace's division, and Stuart's brigade from Sherman's division. Hurlbut was near a peach orchard, Prentiss was near the Sunken Road, and W.H.L. Wallace was adjacent to Duncan Field at the Sunken Road. After a failed attack and the addition of more men, the Confederates attacked Sherman and McClernand again at 11:00 am. This Confederate attacking force consisted of portions of seven brigades. The Union losses in this attack included Colonel Raith, who was mortally wounded, and Behr's battery which fled to the rear after Behr was shot dead. On the Confederate side, Wood's brigade took heavy losses, but routed the brigade of Colonel C. Carroll Marsh from McClernand's division. Wood's men then defeated Veatch's brigade, but Wood was thrown from his horse and temporarily out of action. At that time, his brigade became scattered and disorganized. By 11:20 am, the Confederate army controlled the Hamburg-Purdy Road. Benefitting from the exhaustion and disorganization of the Confederate force, Sherman and McClernand fell back about 200 yards (180 m) north of the crossroads. Sherman's separated First Brigade (McDowell) linked with McClernand around 11:30 am.
Sunken Road and Hornet's Nest
The Sunken Road was an old wagon track called "an abandoned road" in the only time it was mentioned in the Official Records. From west to east, it ran from Duncan Field to a peach orchard (eventually known as "the Peach Orchard") at the Hamburg-Savannah Road. The old wagon track was so worn and washed–over that it had an embankment that ranged from a few inches (7.6 cm) to supposedly three feet (0.91 m). This ready-made entrenchment received the name "Sunken Road" in post-war years. Some historians doubt that the road was actually sunken. Nothing in the Official Records mentions it as sunken, and the soldier who wrote in his diary that the road was about three feet deep was in a regiment that was not close enough to the road to see it. When the fighting later became heated in this area—Duncan Field, the Sunken Road, and the woods on the north side of the road—the Confederates began calling it the Hornets Nest. At the beginning of the day, Prentiss had 7,545 men present for duty. By the time he moved back to Barnes Field near the Hamburg-Purdy Road, after casualties and men that ran away, he had only 600 men and portions of two batteries. He deployed his men near the divisions of W.H.L. Wallace and Hurlbut, along the Sunken Road. Grant reinforced Prentiss with 600 men from the 23rd Missouri Infantry Regiment, which had disembarked from Pittsburg Landing a few hours earlier. Grant visited the 1,200-man force, and told Prentiss to "hold at all hazards". The Union troops along the Sunken Road were protected by hickory and oak trees. Some Union troops at this location had modern (for 1862) weapons and fences for shelter, while some of the Confederate attacks were across open ground. These factors combined to make frontal assaults difficult for the Confederate attackers. One attack was led by Confederate division commander Benjamin F. Cheatham, and his Second Brigade was thoroughly repelled. Southeast of the Sunken Road, Stuart still held the Union left. The Confederate brigades commanded by brigadier generals James R. Chalmers and John K. Jackson attacked Stuart's three regiments. The intensity of the fight increased around 11:15 am, causing most of the 71st Ohio Infantry Regiment to flee to the rear. Stuart repositioned his remaining two regiments, but eventually they began panicking. Although Stuart restored order, he was wounded and command temporarily fell to Lieutenant Colonel Oscar Malmborg.
Battle, afternoon of April 6
Lew Wallace's division had made little progress following Grant's order to move to the battlefield. Early in the morning, his division had been spread as much as five miles (8.0 km) from Crump's Landing. The purpose of this positioning was to protect routes that would be used by reinforcements in case his isolated division was attacked. An additional messenger from Grant found him at 11:30 am, and Wallace did not get his division moving until noon. Another messenger found Wallace at 2:00 pm, and notified Wallace that he was on the wrong road. Wallace believed he was to reinforce Sherman and McClernand at their original camps—he was unaware that those divisions had been pushed back toward Pittsburg Landing. By noon, Sherman and McClernand had been pushed back to Jones Field. However, the three regiments from McDowell's First Brigade had reunited with Sherman and McClernand, and three additional regiments arrived for reinforcement. McClernand's troops began a counterattack with the assistance of McDowell's brigade. The Confederates were pushed back beyond McClernand's morning headquarters, and both sides had numerous casualties. With reinforcements, the Confederate forces began a bayonet charge at about 1:00 pm that pushed McClernand and McDowell back to their original counterattack line at Jones Field.
=== Early afternoon === On the Union right, the divisions of Sherman and McClernand (plus Veatch's brigade) were a disorganized group of individual soldiers and portions of regiments. Many soldiers had dropped their equipment and headed to Pittsburg Landing. Still, Sherman and McClernand fought on with the remnants of their divisions. The situation at the Union center was much better. Prentiss repelled multiple attacks by the brigade commanded by Colonel Randall L. Gibson. Captain Andrew Hickenlooper's 5th Ohio Independent Light Artillery Battery used shrapnel and canister to stop the first charge, and Confederate losses were considerable. After a third try, Gibson's brigade suffered enough casualties (including one colonel hit in the face) that most of the men fell back, and the brigade was not engaged for the rest of the day. Among the Union soldiers killed was Major James Powell, who led the early morning patrol that discovered the Confederate army at Fraley Field. While Prentiss was defending against Gibson, Sweeny repelled Confederate attacks near Duncan Field. The Union left, even more so than the right, was pushed back. Stuart's two remaining Union regiments, temporarily commanded by Lieutenant Colonel Malmborg in the absence of Colonel T. Kilby Smith, made several stands east of Bell Field against two of Bragg's brigades. Fortunately for the Union army, Bragg's hungry men exhausted their ammunition and pillaged food from the Union camps instead of continuing the attack. Around 2:15 pm, Smith ordered Stuart's brigade to withdraw, and by 2:30 pm Stuart's brigade was done fighting for the day. While Stuart was fighting, the adjacent position in the Union line was occupied by McArthur's partial brigade. McArthur's force was attacked around 2:00 pm by one of Breckinridge's brigades. Despite reinforcements, McArthur fell back about 300 yards north of the Peach Orchard where he stabilized his line 20 minutes later. On McArthur's right, Hurlbut's division was also under attack, causing it to fall back. Most of the attackers were from Breckinridge's Third Brigade, commanded by Colonel Walter S. Statham. As the Union troops fell back, they would pause to shoot at the oncoming Confederates. Artillery was also used to slow the attackers.
==== Johnston killed ==== General Albert Sidney Johnston rode as much as 40 paces in front of Breckinridge's line. His uniform was torn from bullets in several places, and the heel of one of his boots was gone. After sending an order to Colonel Statham, an object could be heard striking Johnston. Although blood could be seen dripping from his leg, the general did not show concern. Shortly afterwards, he was slumping in his saddle. Asked if he was wounded, Johnston replied "Yes, and I fear seriously." Johnston bled to death from a torn popliteal artery in his right leg. Although a tourniquet might have saved Johnston's life, his personal physician had been sent elsewhere to treat the wounded. Johnston died about 100 yards (91 m) south of the Bell Farm at 2:30 pm. He was the highest-ranking soldier killed in combat in the American Civil War. With the death of Johnston, Beauregard officially became the Confederate army's commander. Some historians argue that since Beauregard was directing the army from the rear while Johnston was at the front, Beauregard already had the role of army commander. The Confederate attack on its right (Union left) stalled after Johnston's death, and many exhausted Confederate soldiers drank from what became known as the "Bloody Pond" located between the Peach Orchard and Wicker Field. The lull was caused more by the exhaustion and disorganized condition of the Confederate army than mourning for Johnston or Beauregard's lack of action. Beauregard sent Brigadier General Daniel Ruggles to coordinate an attack on the Hornet's Nest.
Union left and right
At 2:50 pm, Lieutenant William Gwin, commander of the USS Tyler, put his gunboat into action by firing on the Confederate batteries near the Union left. After an hour, Gwin was joined by the USS Lexington, and the two gunboats positioned themselves about three–fourths of a mile (1.21 km) south of Pittsburg Landing. At first, the shelling (gunboat shells were larger than those used by field artillery) had more of a psychological impact than a destructive one. On the ground at the Union left, McArthur's partial brigade fought the Confederate brigades commanded by brigadier generals John K. Jackson and John S. Bowen. With Stuart now gone, McArthur was also getting outflanked by Chalmers's Brigade. Between 3:00 and 4:00 pm, McArthur moved all the way back to Pittsburg Landing. Hurlbut's line was also falling back, and only one regiment remained by 4:30 pm when Hurlbut ordered it to the rear.
Late afternoon
Sometime in the late afternoon, Grant assigned Colonel Joseph Dana Webster, a veteran of the Mexican–American War, the task of setting up a defensive position at Pittsburg Landing. Webster used stragglers and noncombatant personnel. He began rounding up artillery pieces, including siege guns and any batteries (or partial batteries) that retreated back to the landing. He eventually assembled about 50 artillery pieces, and they were positioned on a ridge on the east side of the battlefield. At the Union right, Grant visited Sherman around 3:00 pm, and found a difficult situation. The remaining regiments had few men, ammunition was low, and more men were either leaving or serving with other units. Some regiments had so many losses that they were ordered to Pittsburg Landing where they could reform. The Union line at this time was back to Jones Field and the surrounding area. The Confederate army facing Sherman and McClernand was reorganizing, and some of the units were shifted to the Hornet's Nest. After another attack at 4:00 pm, Sherman and McClernand fell back further around 5:00 pm. On the Union left, Bragg tried to pursue the retreating Union soldiers, but was harassed by Union gunboats firing with increasing accuracy. The Tennessee River was near high tide, and the Union gunboat leaders had discovered that by elevating their guns and using lower charges, they could hit targets close to the river. The Tyler had some direct hits on Chalmers's Brigade beginning at 5:35 pm.
Hornet's Nest becomes focus
The Confederate army spent a considerable amount of time and resources assaulting the Hornet's Nest instead of bypassing it. Historians' estimates of the number of separate infantry charges, including those from earlier in the morning, range from eight to fourteen. An estimated 10,000 Confederate soldiers were involved. At 3:30 pm, the Confederate army began moving all available artillery pieces into positions around the Hornet's Nest. Soon they had, at the time, the largest concentration of field artillery (over 50 pieces) ever on the North American continent. This concentration, known as "Ruggles's Battery" was led by Brigadier General Ruggles. In his report, Ruggles claimed responsibility for assembling the batteries, but multiple people may have been involved—including Major Francis A. Shoup (Hardee's artillery chief) and Brigadier General James Trudeau. By 4:00 pm, the Confederate artillery was firing on Wallace and Prentiss in the Hornet's Nest. Confederate artillery was concentrated near Duncan Field and to the south near the Eastern Corinth Road. It was not until 4:30 pm that all Confederate artillery batteries were engaged, and at least one historian believes their effectiveness has been exaggerated. Shortly after 4:00 pm, Hurlbut was gone from the east side of the Hornet's Nest, and McClernand had fallen back about a half mile (0.8 km) from the west side. Realizing that they were going to be surrounded, Brigadier General W.H.L. Wallace began leading his division north. Around 4:15 pm, he was mortally wounded as a portion of his division escaped encirclement. A ravine north of the Sunken Road near Cloud Field became known as "Hell's Hollow", and over 1,000 Union soldiers were captured there. By 4:45 pm, most of Wallace's division was removed from the battlefield, and Prentiss was left with about 2,000 men. Around 5:30 pm, various Union regiments began surrendering (including Prentiss), and approximately 2,200 Union soldiers were captured. In his memoirs, Grant was critical of Prentiss for not making a timely withdrawal. However, the Hornet's Nest stand by Prentiss and W.H.L. Wallace (who was there longer and had more men under his command) allowed Grant more time to prepare his Last Line.
