North Anna Home Guards. See Virginia Troops, Confederate.

North Carolina Second Infantry. See Union Troops, Colored, 36th Regiment.

North Carolina Third Infantry. See Union Troops, Colored, 37th Regiment.

Northrup's (Charles) Infantry. See New York Troops, 97th Regiment.

Nounnan's (James H.) Cavalry. See Virginia Troops, Confederate, 16th Regiment.

Nowlen's (Garrett) Infantry. See Pennsylvania Troops, 116th Regiment.

Obenchain's (Francis G.) Artillery. See Botetourt Artillery, ante.

O'Ferrall's (Charles T.) Cavalry. See Virginia Troops, Confederate.

O'Hara's (John) Cavalry. See New York Troops, 20th Regiment.

Olcott's (Egbert) Infantry. See New York Troops, 121st Regiment.

Olcott's (Egbert W.) Artillery. See Union Troops, Regulars, 1st Regiment, Battery C.

Oley's (John H.) Cavalry. See West Virginia Troops, 7th Regiment.

Oliphant's (Samuel D.) Infantry. See Union Troops, Veteran Reserve Corps.

Oliver's (Samuel C.) Heavy Artillery. See Massachusetts Troops, 2nd Regiment, Batteries E and F.

Onderdonk's (Benjamin F.) Cavalry. See New York Troops, 7th Regiment.

O'Neal's (Edward A.) Infantry. See Alabama Troops, 26th Regiment.

Oneida Cavalry. See New York Troops.

Opp's (Milton) Infantry. See Pennsylvania Troops, 84th Regiment.

Orange Artillery. See Virginia Troops, Confederate.

O'Riordon's (Callaghan H.) Artillery. See Michigan Troops, 13th Battery.

Orr's (James L.) Infantry. See South Carolina Troops, 1st Regiment, Rifles.

Orwig's (Thomas G.) Artillery. See Pennsylvania Troops, 1st Regiment, Battery E.

Osborn's (Francis A.) Infantry. See Massachusetts Troops, 24th Regiment.

Otey Artillery. See Virginia Troops, Confederate.

Otis' (Charles G.) Cavalry. See New York Troops, 21st Regiment.

Otis' (John L.) Infantry. See Connecticut Troops, 10th Regiment.

Over's (Ewald) Infantry. See Exempts' Battalion, ante.

Overton's (Edward, jr.) Infantry. See Pennsylvania Troops, 50th Regiment.

Owen's (Edward) Artillery. See Washington (La.) Artillery, post, 1st Battery.

Page's (John H.) Infantry. See Union Troops, Regulars, 3rd Regiment.

Palmer's (Charles W.) Cavalry. See Purnell Legion, Cavalry, post.

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

Palmetto Artillery. See South Carolina Troops.

Palmetto Artillery, Numbers 2. See South Carolina Troops.

Pamunkey Heavy Artillery. See Virginia Troops, Confederate.

Paris' (Andrew B.) Artillery. See Staunton Hill Artillery, post.

Parker's (Nathan) Cavalry. See Kentucky Troops, Confederate, 4th Regiment.

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

Parnell's (William R.) Cavalry. See New York Troops, 4th Regiment.

Parsons' (Joseph B.) Infantry. See Massachusetts Troops, 10th Regiment.

Patapsco Guards, Infantry. See Maryland Troops, Union.

Patterson's (George M.) Artillery. See Sumter Artillery, post, Battery B.

Patterson's (John W.) Infantry. See Pennsylvania Troops, 102nd Regiment.

Patton's (George S.) Infantry. See Virginia Troops, Confederate, 22nd Regiment.

Patton's (William) Cavalry. See Indiana Troops, 3rd Regiment.

Payne's (William H.) Cavalry. See Virginia Troops, Confederate, 37th Battalion.

Peale's (Henry) Infantry. See Connecticut Troops, 18th Regiment.

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

Pearson's (Henry H.) Infantry. See New Hampshire Troops, 6th Regiment.

Pee Dee Artillery. See South Carolina Troops.

Pence's (J. H.) Artillery. See William M. Lowry's Artillery, ante.

Penick's (Nathan) Artillery. See John W. Lewis' Artillery, ante.

Peninsula Scouts, Cavalry. See Virginia Troops, Confederate, 42nd Battalion.