In 1862, during the Civil War, Union Admiral David Farragut captured New Orleans, and the seat of government retreated from Baton Rouge. The Union's occupying troops first used the capitol building — or "old gray castle," as it was once described — as a prison, and then to garrison African-American troops under General Culver Grover. While used as a garrison the building caught fire twice. This sequence of events transformed Louisiana's capitol into an empty, gutted shell abandoned by the Union Army.