On April 15, 1861, at the start of the American Civil War, the President of the United States, Abraham Lincoln, called for a 75,000-man militia to serve for three months following the bombardment and surrender of Fort Sumter. Some slave states refused to send troops against the neighboring Deep South slave states of South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, and Texas with the result that most such states in the Upper South of Virginia, Arkansas, North Carolina, and Tennessee also declared secession from the United States and joined the Confederate States. Missouri and Kentucky did not fully secede themselves from Union control but they were admitted by the Confederacy as the 12th and 13th states respectively while Maryland and Delaware stayed in the Union throughout the duration of the war.