 On July 1, they marched to Hanover, Pennsylvania, completely unaware that elements of the Army of the Potomac had engaged the Confederates some away in the first day of fighting during the Battle of Gettysburg.Not long after they settled down for the evening, orders came for them to march.The 22nd, and the rest of the V Corps, marched through the night to Gettysburg, reaching the battle around dawn on July 2.