Henry Warner Slocum Sr. (September 24, 1827 – April 14, 1894), was a Union general during the American Civil War and later served in the United States House of Representatives from New York. During the war, he was one of the youngest major generals in the Army and fought numerous major battles in the Eastern Theater and in Georgia and the Carolinas. While commanding a regiment, a brigade, a division, and a corps in the Army of the Potomac, he saw action at First Bull Run, the Peninsula Campaign, Harpers Ferry, South Mountain, Antietam, and Chancellorsville.
At Gettysburg, he was the senior Union General in the Field, under Gen. George G. Meade. During the battle, he held the Union right from Culp's Hill to across the Baltimore Pike. His successful defense of Culp's Hill was crucial to the Union victory at Gettysburg. After the fall of Vicksburg on the Mississippi River, splitting the southern Confederacy, Slocum was appointed military commander of the district. Slocum participated in the Atlanta Campaign and was the first commander to enter the city on September 2, 1864. He then served as occupation commander of Atlanta.
