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| View Record | Name | Regiment Name Expanded | Side | Regiment State/Origin |
|---|---|---|---|---|
Denis O'Callaghan | Union | Union Regular Army | ||
Timothy O'Callaghan | Union | Union Regular Army | ||
Michael O'Callaghan | Union | Union Regular Army | ||
Frank O'Callaghan | Union | Ohio | ||
Barnard O'Callaghan | Union | Ohio | ||
Cornelius O'Callaghan | Union | Ohio | ||
Wm. O'Callaghan | Union | New York | ||
Francis O'Callaghan | Union | New York | ||
William O'Callaghan | Union | Pennsylvania | ||
Jeremiah O'Callaghan | Union | New York | ||
James O'Callaghan | Union | New Jersey | ||
James O'Callaghan | Union | New Jersey | ||
Bartlett O'Callaghan | Union | Veteran Reserve Corps | ||
Eugene O'Callaghan | Union | Veteran Reserve Corps | ||
Andrew O'Callaghan | Union | Union Regular Army | ||
Timothy O'Callaghan | Union | Union Regular Army | ||
Thomas O'Callaghan | Union | Michigan | ||
Patrick O'Callaghan | Union | Union Regular Army | ||
William O'Callaghan | Union | Michigan | ||
John W. O'Callaghan | Union | Michigan |