On March 5, 1861, the day after his inauguration as president of the United States, Abraham Lincoln received a message from Maj. Robert Anderson, commander of the U.S. troops holding Fort Sumter in Charleston Harbor. The message stated that there was less than a six week supply of food left in the fort. Attempts by the Confederate government to settle its differences with the Union were spurned by Lincoln, and the Confederacy felt it could no longer tolerate the presense of a foreign force in its territory. Believing a conflict to be inevitable, Lincoln ingeniously devised a plan that would...