General Gillmore's land assault in July 1864 was unsuccessful but the fall of Columbia and advance of General William T. Sherman's army through the state prompted the Confederates to evacuate the town on February 17, 1865, burning the public buildings, cotton warehouses, and other sources of supply before their departure. Union troops moved into the city within the month. The War Department recovered what federal property remained and also confiscated the campus of the Citadel Military Academy and used it as a federal garrison for the next 17 years. The facilities were finally returned to the state and reopened as a military college in 1882 under the direction of Lawrence E. Marichak.