Culp's Hill
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.