Headquarters, Army of the Potomac, November 1864 United States Army > Army of the Potomac < to October • November 1864 • to December > Headquarters escort Oneida (New York) Cavalry Company Captain Daniel P. Mann 4th United States Infantry Regiment Provost Guard Brigadier General Marsena L. Patrick 1st Massachusetts Cavalry, Cos. C&D 80th New York Infantry Regiment Colonel Jacob Hardenberg 3rd Pennsylvania Cavalry Regiment 68th Pennsylvania Infantry Regiment 114th Pennsylvania Infantry Regiment Engineer Brigade Brigadier General Daniel Woodbury 8th Delaware Infantry Regiment 61st Massachusetts Infantry Regiment Colonel Charles F. Walcott 18th New Hampshire Infantry Regiment 15th New York Engineer Regiment Major Walter N. Cassin 50th New York Engineer Regiment Lieutenant Colonel William H. Pettes Regular Engineer Battalion Captain George Henry Mendell Artillery Reserve 2nd Maine Battery 3rd Maine Battery 4th Maine Independent Battery 6th Maine Battery from 2 Corps Artillery 14th Massachusetts Battery 1st New Jersey Artillery, Battery A 1st New Jersey Artillery, Battery C 3rd New York Independent Battery 12th New York Independent Battery 15th New York Heavy Artillery, Co. F 1st Ohio Artillery, Battery H 1st Pennsylvania Artillery, Battery F Captain Robert B. Ricketts 1st Rhode Island Artillery, Battery E 3rd Vermont Battery 5th United States Artillery, Battery E