The election of Abraham Lincoln in 1860 caused several states to secede in protest. This put Lee in a difficult position. The newly formed Confederate States of America offered Lee the rank of brigadier general. Lee did not respond to the offer. Winfield Scott offered him command of the army of U.S. volunteers. He didn't answer this offer, either. Between April 12–14, 1861, U.S. troops were bombarded at Fort Sumter at Charleston, South Carolina. The same day Virginia seceded from the Union. Lee did not support secession but he could not fight his own state of Virginia. Lee resigned his U.S. Army commission on April 22, 1861, at Arlington House. He told his friends that he would not be a part of an invasion of the South. Several days later he accepted command of all Virginia forces.