Early commands At the outbreak of the Civil War, Slocum was appointed colonel of the
27th New York Infantry, which was a two-year regiment mustered in at
Elmira, New York. He led the regiment at
First Bull Run, where it was in the thick of the fighting, losing 130 men. Slocum himself was badly wounded, and after recuperating, he got command of a brigade in General
William B. Franklin's division in the Army of the Potomac. When Franklin became commander of the new
VI Corps in May 1862, Slocum took over command of the division, leading it with distinction during the
Seven Days Battles. General Fitz-John Porter complimented Slocum's division in the Virginia campaigns as "one of the best divisions in the Army." On July 25, 1862, Slocum was promoted to
major general of volunteers to rank from July 4, the second youngest man in the Army to achieve that rank. At Antietam, Slocum's division was not significantly engaged. The following month, he was named permanent commander of the
XII Corps, which had lost its commander, General
Joseph K. Mansfield at Antietam. During the Fredericksburg Campaign, Slocum and the XII Corps were stationed around Harper's Ferry and had no involvement in the
Battle of Fredericksburg. At the
Battle of Chancellorsville on May 1–5, 1863, Slocum commanded the Union right wing, including the XII Corps and the V Corps of Maj. Gen.
George G. Meade and the XI Corps of Maj. Gen.
Oliver O. Howard, a combined force of 46,000 men. Slocum executed well and maneuvered his wing into the rear of Gen.
Robert E. Lee's army, halting the Confederate advance. When
Joe Hooker was removed from command of the army on June 28, Slocum, as the ranking corps commander, would normally be in line to succeed him, but the War Department instead appointed
George Meade as army commander, apparently feeling that he was a more aggressive fighter. Slocum graciously consented to serving under Meade, his junior in rank.
Gettysburg by
Frederick William MacMonnies in Brooklyn's
Prospect Park Maj. Gen. Slocum played a decisive role in the Union victory at the Battle of Gettysburg, July 1–3, 1863. His XII Corps troops' defense of Culp's Hill on the Union right is credited with ensuring Meade's ultimate victory against Lee's army. Despite this, some modern historians of Gettysburg have questioned the actions of Slocum on the afternoon of July 1, 1863. They allege that he failed to come to the immediate aid of General Howard's XI Corps and engage Confederate troops in a timely way at Gettysburg. Information from recently accessed records, however, including Gen. Meade's archives, shows that Slocum, in fact, dispatched the First Division of his Corps to Gettysburg immediately upon hearing the first report of the fighting. Further, Gen. Slocum's First Division commander, Brig. Gen. Alpheus S. Williams, verified this as he reported in late 1865 that "when reports of the battle going on in advance of Gettysburg were brought to Gen. Slocum ... orders were issued to put the corps in motion," and the "corps was immediately put in rapid march toward the scene." A report by Maj. Guindon, whom Slocum had sent on a reconnaissance mission, corroborates Williams' report; Maj. Guindon indicated that Slocum moved out troops even before he received a request for aid from Gen. Howard. Furthermore, Slocum advanced his First Division despite an order (known as the "Pipe Creek Circular") issued by General Meade that morning, and received by Slocum at 1:30 pm, to "halt your command where this order reaches you." Contrary to modern interpretation, Slocum's actions in fact showed initiative. Slocum arrived at the battlefield marching from Two Taverns on the Baltimore Pike, about 5 miles southeast of the battlefield, late in the afternoon on July 1, 1863. As the ranking general on the field, Slocum commanded the Union army for about six hours, until Meade arrived after midnight. During this time, Slocum was responsible for the supervision of the formation of the Union defensive lines. For the duration of the battle, Slocum would command the Union line from the "point of the fish hook" from Culp's Hill to the south. Slocum's XII Corps would successfully defend Culp's Hill for three days, denying a Confederate victory at this most crucial of battles. During the battle of Culp's Hill, in addition to his own XII Corps, Slocum commanded elements of the I, VI and XI Corps. On July 2 at midnight, Gen. Meade called for a council of war with his corps commanders. It was held at his field headquarters in the front room of the Leister house. He asked his commanders whether the Union Army should remain in its present position, or to retire to another position nearer its base of supplies. Further, if the Army remained in its present position, should it attack or await the attack of the enemy. It is then that Slocum gave his recommendation to "Stay and fight it out." Meade planned an attack from the Power's Hill area into the
Confederate left flank, to be led by Slocum the following day, utilizing the V Corps and the XII Corps as the army's "right wing." Slocum reported to Meade that he believed the plan was not feasible, as the terrain was too difficult for an assault. General Gouvernor K. Warren agreed with Slocum's assessment. When Meade ordered Slocum to send the entire XII Corps to assist the defense against
Lt. Gen. James Longstreet's assault on the Union left flank on July 2, Slocum wisely recommended holding one brigade back in its position on
Culp's Hill. This brigade, under
Brig. Gen. George S. Greene, was able to hold out against a massive Confederate assault and saved the critical hill for the Union. This brigade was composed of five regiments of infantry, of only 1,350 soldiers. The regiments were: the 60th New York, Colonel Abel Godard; the 78th New York, Colonel Herbert von Hammerstein; the 102nd New York, Colonel Lewis R. Stegman; the 137th New York, Colonel David Ireland; and the 149th New York, Colonel Henry A. Barnum. General Greene later wrote in an article for
Century Magazine, "To the discernment of General Slocum who saw the danger to which the army would exposed by the movement ordered by Meade to deplete the right wing the afternoon of July 2, and who took the responsibility of modifying the orders which he had received from Meade is due the honor of having saved the army from a great and perhaps fatal disaster." Slocum's XII Corps received no medals of honor for the defense of Culp's Hill and the Union right wing."
Western Theater During the autumn of 1863, Slocum was transferred with his corps to the Western Theater. When he learned that he would have to serve under Joe Hooker, Slocum, who had disliked Hooker since Chancellorsville, wrote to President Lincoln saying that he would rather resign from the Army. Lincoln assured him that he would not actually have to serve under Hooker and a compromise was reached whereby one division of the corps, under Slocum, was assigned to protect the Nashville and Chattanooga Railroad while the other division served directly under Hooker. At the start of the
Franklin-Nashville Campaign, Sherman left Slocum in command of 12,000 troops in Atlanta as Sherman pursued Confederate Lt. Gen.
John Bell Hood and his army.
March to the Sea: Savannah Campaign One of General Slocum's most important commands was that of the Army of Georgia, which participated in the famous March to the Sea. Slocum and his Army of Georgia participated in all engagements from the beginning of the March on November 16 until the surrender of the Confederate forces of General Joseph E. Johnston. General William Tecumseh Sherman's March to the Sea, also called the Savannah Campaign, was among the most effective campaigns of the Civil War. The plan was conceived by Sherman himself, and approved by General Ulysses S. Grant and President Abraham Lincoln. Sherman's objective was to divide the Confederacy in two along a West to East path following its strategic rail lines. Sherman's Army would exchange its inland base of Atlanta for the more secure base (Savannah) on the Atlantic coast, which was controlled by the Union Navy. Another objective was to disrupt the Southern economy by limiting access to vast food stores, manufacturing and destroying their rail and communication systems. Furthermore, it would demonstrate that the Southern Army could not defend their heartland. The campaign would prevent reinforcing of Lee's troops defending Petersburg, Virginia, and the Confederate capital of Richmond. Sherman's Savannah campaign was considered a major Union success. Historians have stated that this was a major contribution to the overall Union victory in the war. The March was considered revolutionary, and in some ways unique, in the annals of modern warfare. Sherman's Army was composed of two armies, called wings, and a cavalry division. During the March, they followed separate paths along four parallel routes, 20–60 miles apart. Columns of men could stretch up to 50 miles long. Wagon columns could stretch up to 30 miles. The right wing (southern column; Army of the Tennessee) marched along the Georgia railroad, the Macon and Western railroad. The left wing (northern column; Army of Georgia) marched following the Georgia railroad, feinting toward Augusta. Sherman's plan was to confuse the Confederate Army as to his objectives. The city he was heading for was Milledgeville, the Georgia state capital, which was captured on November 22, 1864. The ultimate objective of the March was the port city of Savannah, which was captured and occupied on December 21, 1864. Sherman later placed Slocum in command of the newly created
Army of Georgia, composed of the XIV Corps and the XX Corps from the
Army of the Cumberland, which served as the left wing in
Sherman's March to the Sea. The total number of officers and men in Slocum's Army of Georgia was 26,703. The XIV Corps, commanded by Brig. Gen.
Jefferson C. Davis, had 13,962 officers and men. The XX Corps, commanded by Brig. Gen. Alpheus S. Williams, had 13,714 officers and men. The other wing, consisting of the XV and XVII Corps of the
Army of the Tennessee, was commanded by Gen.
Oliver O. Howard. Sherman's Army travelled light. Individual soldiers carried only minimal amounts of supplies, ammunition, rations. The Army, cut off from its supply base, partially lived off captured supplies. Sherman brought sufficient rations for the initial campaigns. He wrote, "I had wagons enough loaded with essentials, and beef cattle enough to feed on for more than a month, and had the census statistics showing the produce of every county through which I desired to pass. No military expedition was ever based on sounder or surer data." Each brigade had 50 enlisted men and one officer foraging team for supplying food. Approximately 3,000 infantrymen were engaged in foraging on any given day of the March. That represents 5% of all infantrymen on the March. The Savannah campaign was launched on November 15 and concluded with the capture and occupation of Savannah on December 21, 1864 (36 days). Upon reaching
Savannah, Slocum took the surrender of the city on December 21, 1864. Slocum then set up fire guards and prevented the city of Savannah from being damaged. On December 22, Sherman telegraphed Abraham Lincoln, presenting Savannah as a Christmas present to Lincoln and the Union. After the capture of the city, Slocum recommended to Sherman that Confederate Gen.
William J. Hardee's corps, whose only escape route was north over a causeway, be cut off. But Sherman rejected Slocum's plan, and Hardee escaped, to fight again at
Bentonville.
Carolinas Campaign The Carolinas Campaign was launched leaving Savannah in late January 1865. Slocum's troops marched a total of 425 miles (684 km) in 50 days. The march had been far more demanding than the March to the Sea, as the terrain was more difficult and there was much more rain. The Confederate forces opposing Sherman's army were even smaller than during the Savannah campaign. In mid-April, Confederate Gen. Johnston met with Confederate President Jefferson Davis in Greensboro, North Carolina. He confessed: Our people are tired of the war, feel themselves whipped, and will not fight. Our country is overrun, its military resources greatly diminished, while the enemy's military power and resources were never greater and may be increased to any extent desired. ... My small force is melting away like snow before the sun. During the
Carolinas campaign, Slocum's army was heavily engaged at the
Battle of Averasborough, on March 15–16, 1865, and the
Battle of Bentonville, on March 19, 1865, where Slocum successfully held off a surprise assault by Gen.
Joseph E. Johnston. After Slocum's defeat of the Confederate forces at Bentonville, an officer of Sherman's staff wrote: "Slocum was more than equal to the necessity of the hour, and his success justified General Sherman's selection of him as commander of the Left Wing of the Army." The principal loss to the Confederacy was the freeing of individuals from slavery. Estimated Confederate losses: 100 million dollars (1.4 billion in 2010 dollars) – Estimated (General Sherman estimated this damage, but it was not based on any actual tallying of figures); 20 million dollars – General Sherman estimated that this amount was confiscated by the Union Army during the March. The left wing of Sherman's march destroyed 125 miles of railroad track. As a direct result of Sherman's March through the South, thousands of slaves left their plantations and workplaces and joined Sherman's army as refugees. It is estimated that between 17,000 and 25,000 newly freed enslaved people followed Sherman's army during the march through Georgia. It is estimated that 8,000 of these newly freed individuals followed the army into Savannah. In addition, it is estimated that 7,587 individuals were freed from slavery in Savannah and its surrounding areas on December 21, 1864. Wherever Sherman's March went throughout Georgia and the Carolina's, he was enforcing the provisions of the Emancipation Proclamation. Both Army commanders under General Sherman were abolitionists who opposed slavery. General Oliver O. Howard of the Army of the Tennessee and General Henry W. Slocum were active in the anti-slavery movement. Several other general officers were abolitionists. Hundreds of men liberated from slavery served in the columns as teamsters, cooks, and cleared and built roads, etc. They helped in convoys, as wagoneers and teamsters, and helped in various camp duties. They provided service as guides and scouts, provided military intelligence about the position of the Confederate Army. Individuals liberated from slavery also informed Union commanders about where provisions could be found. Union officers praised these highly valued individuals. Formerly enslaved men also aided escaped Union soldiers. A Union officer wrote: "What they have done for the Army entitles them to their freedom or whatever they may desire." Many of the Union soldiers saw the evils of slavery for the first time. Many of them commented in their letters home that it had changed their ideas about why the war was being fought.
End of the War After Confederate General Joseph E. Johnston's surrender at Durham Station, North Carolina, General Slocum and the Army of Georgia made their way north to Washington, DC. The XIV and XX Corps participated in the Grand Army Review in Washington, DC, on Wednesday, May 24, 1865. Slocum commanded the Department of the Mississippi from April through September 1865. With the end of the war, Slocum resigned his commission in the volunteers on September 28, 1865, rather than accept an appointment in the
Regular Army at a reduced rank, and returned to Syracuse, New York. A year later, the army gave him an offer to come back into service as commander of the 31st US Infantry, but he turned it down. ==Postbellum life==