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| View Record | Name | Regiment Name Expanded | Side | Regiment State/Origin |
|---|---|---|---|---|
Frank M. O'Callahan | Union | Ohio | ||
Cornelius A. O'Callahan | Union | Ohio | ||
Joseph O'Callahan | Union | New York | ||
Mich'l. O'Callahan | Union | New York | ||
Michael O'Callahan | Union | New York | ||
Wm O'Callahan | Union | New York | ||
John O'Callahan | Union | New York | ||
James O'Callahan | Union | New York | ||
Edward O'Callahan | Union | New York | ||
James O'Callahan | Union | New York | ||
Timothy O'Callahan | Union | New York | ||
John O'Callahan | Union | New York | ||
James O'Callahan | Union | New Jersey | ||
William O'Callahan | Union | Veteran Reserve Corps | ||
Eugene O'Callahan | Union | Veteran Reserve Corps | ||
Bartlett O'Callahan | Union | Veteran Reserve Corps | ||
Bartlett O'Callahan | Union | Veteran Reserve Corps | ||
Eugene O'Callahan | Union | Veteran Reserve Corps | ||
Miles M. O'Callahan | Union | Missouri | ||
Dennis O'Callahan | Union | Missouri |