 His subordinate officers included Col. George S. Patton of the 22nd, and Col. William Lowther Jackson of the 19th Virginia Cavalry (later promoted to brigadier general).On April 20, 1863, Imboden moved westward from Shenandoah Mountain with 1,825 men, and reinforcements the next day increased his strength to 3,365.Imboden marched through a heavy rain and then snow toward Beverly.