A.P. Hill's most memorable day of the Civil War was September 17, 1862 at Sharpsburg, Maryland. After the Second Corps had captured the Union garrison at Harpers Ferry, Virginia, Hill was left behind to handle the surrender while the rest of Lee's army continued to move through Maryland. When the Confederates encountered McClellan's Army of the Potomac across Antietam Creek, Hill made an extraordinary forced march from Virginia to arrive in time to launch a ferocious mid-afternoon assault against Burnside's Ninth Corps. He saved Lee's outnumbered army from almost certain destruction in what was the bloodiest single day of the war and, indeed, in American history. Shortly afterward, Lee called Hill his best general after Longstreet and Jackson, observing, "He fights his troops well and takes good care of them."