O'Connell's (Patrick) Pioneers. See Union Troops, Pioeer Brigade, pontoon Battalion.

O'Hara's (Thomas) Cavalry. See Illinois Troops, 11th Regiment.

Oliver's (John M.) Infantry. See Michigan Troops, 15th Regiment.

Oliver's (McDonald) Artillery. See Eufaula Artillery, ante.

O'Neal's (Francis A.) Artillery. See Alabama Troops, Confederate, 20th Battalion Battery B.

O'Neill's (John) Infantry. See Tennessee Troops, Confederate, 10th Regiment.

Opdycke's (Emerson) Infantry. See Ohio Troops, 125th Regiment.

Orcutt's (Benjamin F.) Infantry. See Michigan Troops, 25th Regiment.

Orleans Light Horse Cavalry. See Louisiana Troops.

Orr's (J. A.) Infantry. See Mississippi Troops, Confederate, 31st Regiment.

Osband's (Embury D.) Cavalry. See Union Troops, Colored, 3rd Regiment.

Osborne's (Richard) artillery. See Illinois Troops, 2nd Regiment, Battery F.

Otey Artillery. See Virginia Troops.

Owen's (Alfred D.) Infantry. See Indiana Troops, 80th Regiment.

Owens' (James A.) Artillery. See Arkansas Troops.

Owens' (Robert A.) Infantry. See Tennessee Troops, Confederate, 46th and 55th Regiments.

Packer's (Warren W.) Infantry. See Connecticut Troops, 5th Reigment.

Paddock's (Buron D.) Artillery. See Michigan Troops, 1st Regiment, Battery F.

Palmer's (William J.) Cavalry. See Pennsylvania Troops, 15th Regiment.

Palmetto Battalion, Artillery. See South Carolina Troops.

Palmetto Sharpshooters, Infantry. See South Caolina Troops.

Pardee's (Ario, jr.) Infantry. See Pennsylvania Troops, 147th Regiment.

Pardue's (Lucien B.) Infantry. See Mississippi Troops, Confederate, 7th Battalion.

Park's (J. M.) Cavalry. See Mississippi Troops, Confederate, 1st Regiment, Partisan Rangers.

Park's (Josiah B.) Cavalry. See Michigan Troops, 4th Regiment.

Parker's (William) Infantry. See Tennessee Troops, Confederate, 60th, 61st, and 62 Regiments.

parker's (William W.) Artillry. See Virginia Troops.

Parrish's (Charles S.) Infantry. See Indiana Troops, 130th Regiment.

Parrott's (James C.) Infantry. See Iowa Troops, 7th Regiment.

Parry's (Agustus C.) Infantry. See Ohio Troops, 47th Regiment.

Partenheimer's (Frederick) Infantry. See Missouri Troops, Union, 18th Regiment.

Patrick's (John H.) Infantry. See Ohio Troops, 5th Regiment.

Patrick's (Matthewson T.) Cavalry. See Iowa Troops, 5th Regiment.

Patterson's (Michael L.) Infnatry. See Tennessee Troops, Union, 4th Regiment.

Patton's (Samule K. N.) Cavalry. See Tennessee Troops, Union, 8th Regiment.

Pearce's (John S.) Infantry. See Ohio Troops, 98th Regiment.

Pearson's (Robert N.) Infantry. See Illinois Troops, 31st Regiment.

Peat's (Frank F.) Infantry. See Illinois Troops, 17th Regiment.

Peeple's (Tyler M.) Artillery. See Georgia Troops, 9th Battalion, Battery D.

Pelham Cadets, Infantry. See Alabama Troops, Confederate.

Perkins' (George T.) Infantry. See Ohio Troops, 105th Regiment.

Perry's (Thomas J.) Artillery. See Marion Artillery, ante.

Perry's (William F.) Infantry. See Alabama Troops, Confedeate, 44th Regiment.

Peters' (John H.) Cavalry. See Iowa Troops, 4th Regiment.

Peters' (William E.) Cavalry. See Virginia Troops, 21st Regiment.

Pharr's (H. N.) Engineeers. See Confederate Troops, Regulars, 3rd Regiment.

Pehlan's (John) Artillery. See William H. Fowler's Artillery, ante.

Phillips Legion. See Georgia Troops.

Pickands' (James) Infantry. See Ohio Troops, 124th Regiment.

Ping's (Thomas) Infantry. See Iowa Troops, 17th Regiment.