Battery M, Second U.S. Artillery

First Brigade Horse Artillery

Army of the Potomac

Cavalry Corps

First Brigade Horse Artillery

Battery M Second U.S. Artillery

Six 3 inch rifles

Lieut. A. C. M. Pennington Commanding

July 2 Engaged with the Confederates at Hunterstown

July 3 Engaged in Brig. General Custer's Brigade with Major General ...