Union Order of Battle at Gettysburg
Army of the Potomac, Cavalry Corps, Artillery Brigades

1st Horse Artillery Brigade Cavalry Corps Captain James M. Robertson Born in New Hampshire, Age 46	2nd Horse Artillery Brigade Cavalry Corps Captain John C. Tidball Born in Virginia, Age 38 Wikitree Information
Units: 9th Michigan Light | 111 men 6th New York Light | 103 men 2nd U.S. Light, Batteries B and L | 99 men 2th U.S. Light, Battery M | 117 men 4th U.S. Light, Battery E | 61 men	Units: 1st U.S. Light, Batteries E and G | 85 men 1st U.S. Light, Battery K | 114 men 2nd U.S. Light, Battery A | 75 men 3rd U.S. Light, Battery C | 142 men