The Mississippi River campaigns, within the Trans-Mississippi Theater of the American Civil War, were a series of military actions by the Union Army during which Union troops, helped by Union Navy gunboats and river ironclads, took control of the Cumberland River, the Tennessee River, and the Mississippi River, a main north-south avenue of transport.
The campaign on and along the Mississippi River started in February 1862 with Union forces pushing down from Cairo, Illinois into disputed territory in Missouri and Kentucky and Confederate territory in Tennessee. It ended with the surrender of the last Confederate strongholds on the Mississippi River, Vicksburg, Mississippi on July 4, 1863 and of Port Hudson, Louisiana on July 9, 1863. Flag Officer Foote initially commanded the Union naval forces, which were later led by Farragut and Porter.