Battery No. 1, Near Yorktown, Virginia (U.S. Civil War) Battery No. 1 refers to a historical artillery battery located near the town of Yorktown in the U.S. state of Virginia. Significant during the American Civil War, it was part of the Confederate defensive positions at the Battle of Yorktown, fought from April 5 to April 6, 1862, and again from May 4 to May 7, 1862. The battle was a decisive victory for the Union forces led by General George B. McClellan, marking an important turning point in the war. Today, Battery No. 1 is part of the Yorktown Battlefield, which is preserved as a national historical park run by the National Park Service.