Edit - Correct, jekct1212. Welcome (a bit belatedly) to the trivia game. Your user name is similar to that of someone who has been playing the game for some time, so I did not initially recognize you as a new player.
That would be P G T Beauregard when he commanded artillery to fire against Fort Sumter. In the fort was a certain Major Anderson (!) who had been PGTB's artillery instructor at West Point (1835-1836).