The Battle of Galveston Harbor was fought at Galveston, Texas on October 4, 1862, during the American Civil War. After attempts to blockade the Texas coastline were unsuccessful, the Union Navy decided to attempt to capture the port of Galveston. While Galveston was defended by Confederate forces, most of the cannons in the city's defenses were removed, as Galveston was thought to be indefensible. On October 4, five Union naval vessels commanded by Commander William B. Renshaw approached Galveston, and a single ship, USRC Harriet Lane was sent into Galveston Bay under a flag of truce.