Odle's Home Guards. (Official designation not of record.) See Captain Odle.

Olden's (William P.) Infantry. See Illinois Troops, 117th Regiment.

O'Neal's (Weden) Infantry. See Kentucky Troops, Union, 55th Regiment.

O'Neil's (Joseph) Infantry. See Union Troops, Veteran Reserve Corps, 2nd Battalion, 126th Company.

Orff's (Henry) Infantry. See Wisconsin Troops, 35th Regiment.

Otwell's (Francis) Infantry. See Union Troops, Veteran Reserve Corps, 2nd Battalion, 94th Company.

Owen Scouts (p. 558). (Official designation not of record.)

Paine's (Byron) Infantry. See Wisconsin Troops, 43rd Regiment.

Palmer's (Frederic S.) Infantry. See Union Troops, Veteran Reserve Corps, 6th Regiment.

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

Palmetto Battalion, Artillery. See South Carolina Troops.

Parsons' (Edwin B.) Infantry. See Wisconsin Troops, 24th Regiment.

Parsons' (Joseph H.) Cavalry. See Tennessee Troops, Union, 9th Regiment.

Partridge's (Jasper) Infantry. See Illinois Troops, 152nd Regiment.

Patterson's (Josiah) Cavalry. See Alabama Troops, Confederate, 5th Regiment.

Pattons' (Samuel K. N.) Cavalry. See Tennessee Troops, Union, 8th Regiment.

Pearsall's (Uri B.) Infantry. See Union Troops, Colored, 99th Regiment.

Pease's (William H.) Artillery. See Ohio Troops, 1st Regiment, Battery F.

Peeble's (Ferdinand E.) Infantry. See Union Troops, Colored, 47th Regiment.

Pelham Cadets, Infantry. See Alabama Troops, Confederate.

Pence's (James M.) Artillery. See Illinois Troops, 2nd Regiment, Battery B.

Penn's (Edmund) Cavalry. See Kentucky Troops, Union, 6th Regiment.

Penn's (George W.) Cavalry. See Kentucky Troops, Union, 6th Regiment.

Pepper's (William T.) Cavalry. See Indian Troops, 13th Regiment.

Perry's (Oran) Infantry. See Indiana Troops, 69th Regiment.

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

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

Pettus Flying Artillery. See Mississippi Troops, Confederate.

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

Phillips' (J. W.) Artillery. See Tennessee Troops, Confederate.

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

Pickard's (Cyrus B.) Cavalry. See Florida Troops, Union, 1st Regiment.

Pierce's (Abial) Cavalry. See Iowa Troops, 4th Regiment.

Pinson's (R. A.) Cavalry. See Mississippi Troops, Confederate, 1st Regiment.

Pollock's (John K.) Infantry. See Illinois Troops, 96th Regiment.

Porter's (Acros S.) Infantry. See Wisconsin Troops, 42nd Regiment.

Porter's (Ed. D.) Cavalry. See Mississippi Troops, Confederate, 18th Battalion.

Porter's (George L.) Heavy Artillery. See Minnesota Troops, 1st Regiment, Battery C.

Poston's (John L.) Cavalry. See Tennessee Troops, Union, 14th Regiment.

Poteet's (George A.) Infantry. See Illinois Troops, 115th Regiment.

Powers' (Frank P.) Cavalry. See Louisiana Troops, Confederate.

Prentice's (Clarence J.) Cavalry. See confederate Troops, Regulars, 7th Battalion.

Preston's (Robert T.) Infantry. See Virginia, Confederate, 5th Regiment, Reserves.

Pridemore's (Auburn L.) Infantry. See Virginia Troops, Confederate, 64th Regiment.

Pritchard's (Benjamin D.) Cavalry. See Michigan Troops, 4th Regiment.

Purvis' Regiment. (Official designation not of record.) See Colonel Purvis.

Putnam's (Azro C.) Artillery. See Edward C. Henshaw's Artillery, ante.

Putnam's (Joseph R.) Infantry. See Union Troops, Colored, 42nd Regiment.

Quantrill's (William C.) Band. (Official designation not of record.) See William C. Quantrill.