Canadian That Fight For America O

This list is a revision, expansion, and (I hope) an improvement upon the previous lists that I have compiled. My intention is to list every Canadian who served in the Civil War for whom there is some sort of documentation. Unfortunately, much of the relevant materials is not readily available, and therefore this list will never be an accurate reflection of the number of Canadians who served in the war. Nevertheless, I hope that the list will bring more attention to the role that these men played and, hopefully, assist some genealogically-minded people in tracking down a long lost ancestor. Please keep in mind that the list is currently a "work in progress". I have pieced much of it together from other lists that I have previously compiled, using different formats. I hope to have this lack of uniformity rectified as soon as possible.

OAKES, Robert--born: Canada; ship: not stated; sources: [4]
O'BEIRNE, Richard Fitzgerald--born: Canada; regiment: 14th United States Infantry (?); sources: [31]
O'Brien, Edward A.--New Brunswick--Sixth Infantry [5]
O'BRIEN, James W.--nativity: Canada East; regiment: 1st Nebraska Cavalry; sources: [11]
O'BRIEN, John--born: Canada; ship: not stated; sources: [4]
O'Brien, John--Montreal, Canada--20th Infantry [MSSM]
O'Brien, John--St. John, N.B.--2nd Heavy Artillery [MSSM]
O'BRIEN, John--born: Halifax, N. S.; regiment: 9th Massachusetts Infantry; sources: [30]
O'BRIEN, Robert--residence: Cornwallis, N.S.; regiment: 15th Massachusetts Infantry; sources: [32] [MSSM]
Oburn, Joseph--Canada--Sixth Infantry [5]
O'CLAIR, Peter--born: Canada; regiment: 57th Massachusetts Infantry; sources: [27]
Odett, Theofelt--Canada--Second Infantry [5]
Odillon, Benoit--Canada--Second Cavalry [5]
O'DONNEL, John--born: Canada; regiment: 3rd Iowa Infantry; sources: [7]
OFFLEY, Washington--born: Canada; ship: see source; sources: [6]
Ogilvie, Wellesley--Nova Scotia--Second Infantry [5]
O'HARE, John P.--born: Kingston, Can.; regiment: 9th Massachusetts Infantry; sources: [30]
OHARRAW, Robert K.--born: Canada; ship: not stated; sources: [4]
OHMSTED, Willis A.--born: Canada (English); regiment: not stated; notes; according to the Civil War Soldiers and Sailors System, there was Willis A. Olmsted who served with the 36th Illinois Infantry, Co. E--this is the only Willis Olmsted in the database--there is a "Olmstead, Willis" of the same regiment residing in Grand Island at the time of the 1895 Veterans Census in Nebraska; sources: [2]
Olds, John--Canada--Second Cavalry [5]
OLENA, Madore--born: Saint Jean, Quebec, Canada; regiment: not stated; sources: [14]
OLENA, Raphael--born: Saint Jean, Quebec, Canada; regiment: 3rd Vermont Infantry; sources: [14]
Oliver, Aaron P.--Canada--Second Infantry [5]
OLIVER, James F.--born: Canada; ship: see source; sources: [6]
Oliver, John B.--Canada--Eighth Infantry [5]
Oliver, Robert B.--Canada--Sixth Infantry [5]
O'MALIA, Michael--born: Canada West; ship: not stated; sources: [4]
O'Malley, Thomas--Broom, Canada East--19th Infantry [MSSM]
O'Mara, Thomas--Canada West--11th Infantry [MSSM]
O'Neal, John--St. John, N.B.--2nd Infantry [MSSM]
O'Neil, James--Canada--Hatch's Independent Battalion [5]
O'Neil, Samuel--Canada--24th and 34th Infantry [MSSM]
O'Neill, John--Canada--Second Cavalry [5]
Onesmine, Geneve--Canada--Fifth Infantry [5]
ORD, John E.--born: Canada; regiment: 9th Vermont Infantry; sources: [14]
ORDISH, Benjamin--residence: Canada; regiment: 1st Michigan Light Artillery; sources: [9]
O'REILLY, Luke--born: Canada; regiment: 33rd Missouri Infantry; sources: [31]
O'Rourke, Henry--Canada--Mounted Rangers [5]
Osborn, John--Canada E.--Second Cavalry [5]
Ostram, Hiram M.--Canada--First Heavy Artillery [5]
OSGOOD, A. P.--born: Canada; regiment: 27th Iowa Infantry; town: Oswald & Pierre; sources: [10]
Ouenett, Prudent--Canada--Tenth Infantry [5]
Ovane, John R.--Canada--Mounted Rangers [5]