John H. Callahan (January 25, 1845 – March 13, 1914) was one of two men from the 122nd Illinois Volunteer Infantry Regiment to receive the Medal of Honor during the American Civil War. Callahan was a private in Company B. The medal was awarded for capturing a Confederate flag during the Battle of Fort Blakely on April 9, 1865; he was one of fourteen men awarded with the Medal of Honor at this battle.
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