Charles Tanner and the 1st Delaware Infantry marched with more than 75,000 Union Soldiers of the Army of the Potomac to intercept advancing Confederate forces at Antietam Creek. During the famed Battle of Antietam on September 17, 1862, Tanner saved his regiment’s colors against staggering odds. On December 13, 1889, Tanner was awarded the Medal of Honor for his efforts..