John O’Brien

Captain

1^st Connecticut Heavy Artillery

Richard James Oglesby

"Uncle Dick"

Major General

John Hunt Oley

Colonel

John Morrison Oliver

Brigadier General

Lewis C. Olmstead

Private

3^rd Michigan

Emerson Opdycke

Brigadier General

Adolphus D. Orcutt

Private

2^nd Nebraska Cavalry

Edward Otho Cresap Ord

U.S.M.A. 1839

Major General

William Ward Orme

Brigadier General

Eli Walter Osborn

Major

15^th Connecticut

Thomas Ogden Osborn

Brigadier General

Peter Joseph Osterhaus

Major General

Joshua Thomas Owen

“Paddy”

Brigadier General

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