Owen's (Joshua T.) Infantry. See Pennsylvania Troops, 24th Regiment (Militia).

Owen's (Samuel W.) Cavalry. See Pennsylvania Troops, 3rd Regiment.

Owens' (James D.) Infantry. See West Virginia Troops, 2nd Regiment.

Paine's (Halbert E.) Infantry. See Wisconsin Troops, 4th Regiment.

Palmer's (Innis N.) Cavalry. See Union Troops, Regulars, 2nd Regiment.

Parker's (William W.) Artillery. See Virginia Troops, Confederate.

Pate's (H. Clay) Cavalry. See Virginia Troops, Confederate, 2nd Battalion.

Patterson's (Francis E.) Infantry. See Pennsylvania Troops, 17th Regiment (Militia).

Patton's (Waller T.) Infantry. See Virginia Troops, Confederate, 7th Regiment.

Paxton's (John C.) Cavalry. See West Virginia Troops, 2nd Regiment.

Pearson's (Alfred L.) Infantry. See Pennsylvania Troops, 155th Regiment.

Pelham's (John) Artillery. See Stuart Horse Artillery, post.

Pelton's (William W.) Infantry. See Vermont Troops, 1st Regiment.

Pemberton's (John C.) Artillery. See Union Troops, Regulars, 4th Regiment, Battery F.

Pennington's (Alexander C. M., Jr.) Artillery. See Union Troops, Regulars, 2nd Regiment, Battery M.

Pennsylvania 1st Rifle Regiment, Infantry. See Pennsylvania Troops, 13th Regiment, Reserves.

Perkins' (Delevan D.) Artillery. See Union Troops, Regulars, 4th Regiment, Battery F.

Pfau's (Philip) Cavalry. See Ohio Troops, 3rd Company.

Philadelphia City Troop, Cavalry. See Pennsylvania Troops.

Piatt's (A. Sanders) Infantry. See Ohio Troops, 34th Regiment.

Pickett's (Josiah) Infantry. See Massachusetts Troops, 25th Regiment.

Pierce's (Lewis B.) Cavalry. See Pennsylvania Troops, 12th Regiment.

Pinckney's (Joseph C.) Infantry. See New York Troops, 6th Regiment (Militia).

Platt's (Edward R.) Artillery. See Union Troops, Regulars, 2nd Regiment, Batteries D and M.

Plimpton's (Josiah I.) Infantry. See New Hampshire Troops, 3rd Regiment.

Porter's (Daniel S.) Infantry. See Pennsylvania Troops, 11th Regiment, Reserves.

Porter's (Josiah) Artillery. See Massachusetts Troops, 1st (A) Battery.

Porter's (Peter A.) Heavy Artillery. See New York Troops, 8th Regiment.

Poschner's (Frederick) Infantry. See Ohio Troops, 47th Regiment.

Pratt's (George W.) Infantry. See New York Troops, 20th Regiment (Militia).

Presiden't Mounted Guard, Cavalry. See District of Columbia Troops.

Preston's (Robert T.) Infantry. See Virginia Troops, Confederate, 28th Regiment.

Prevost's (Charles M.) Infantry. See Pennsylvania Troops, 118th Regiment.

Price's (R. Butler) Cavalry. See Pennsylvania Troops, 2nd Regiment.

Pride's (William G.) Heavy Artillery. See Connecticut Troops, 1st Regiment.

Purdy's (Lovell, Jr.) Infantry. See New York Troops, 74th Regiment.

Purnell Legion, Cavalry. See Maryland Troops, Union.

Randol's (Alanson M.) Artillery. See Union Troops, Regulars, 1st Regiment, Battery E.

Randolph's (George E.) Artillery. See Rhode Island Troops, 1st Regiment, Battery E.

Rensom's (Dunbar R.) Artillery. See Union Troops, Regulars, 5th Regiment, Battery C.

Regan's (Peter C.) Artillery. See New York Troops, 7th Battery.

Reynolds' (Alexander W.) Infantry. See Virginia Troops, confederate, 50th regiment.

Reynolds' (William H.) Artillery. See Rhode Island Troops, 1st Regiment, Battery A.

Richards' (Thomas S.) Cavalry. See Pennsylvania Troops, 1st Regiment.

Richardson's (John B.) Artillery. See Washington Artillery Battalion, post, 2nd Battery.