After graduation from West Point, Pierre Gustave Toutant Beauregard served as an engineer in the Mexican War. However, in 1861, Beauregard left the Union army to fight for his home state of Louisiana. At the beginning of the war, he commanded forces at the takeover of Fort Sumter in 1861. He also commanded southerners at First Manassas, Shiloh, and Drewry's Bluff. For much of the latter half of the war, he commanded the Confederate troops in the Charleston, South Carolina region. While there, he also oversaw the implementation of the first successful combat submarine, The Hunley. He died in 1893.