Winfield Scott Hancock built a four-decade United States Army career that included major Civil War commands, western campaigns, and politically sensitive postwar assignments. Graduating from West Point in 1844, he served in the Mexican-American War and later in Florida and California. He returned east after the Civil War began and became a brigadier general of volunteers in 1861.

His performance at Williamsburg brought praise, and he rose to division command during the campaigns of 1862. At Gettysburg in 1863, he helped stabilize the Union position after the first day's reverses and commanded the Second Corps. His troops played a central role in resisting the Confederate assault commonly called Pickett's Charge. Severely wounded during the fighting, he received Congress's thanks but suffered lasting physical effects.

Hancock returned to field command in 1864, leading the Second Corps through the Wilderness, Spotsylvania, Cold Harbor, and operations around Petersburg. Heavy losses and his recurring wound problems reduced its effectiveness, and he left field command late that year. After the war, he supervised the execution of the convicted Lincoln assassination conspirators and held departmental commands. On the Plains in 1867, his confrontational actions against Native communities contributed to the violence known as Hancock's War, broadening a record often focused on Gettysburg.

During Reconstruction, Hancock emphasized civilian authority and ordinary legal protections in Louisiana and Texas. Democrats welcomed that stance, while critics argued it weakened federal protection for freedpeople in a region marked by racial violence. In 1880 he became the Democratic presidential nominee and lost to James A. Garfield in a close popular contest but a clear electoral defeat. He commanded the Division of the Atlantic until his death in 1886. His tactical skill and courage accompanied contested enforcement of federal power after emancipation and on Indigenous lands.