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From the Augusta, GA Weekly Constitutionalist of 22 October 1862, online from Georgia Historic Newspapers:

John Garland Markham was 5th Sergeant of Company F, 16th Mississippi Infantry when he was killed at Sharpsburg.

First Lieutenant Charles Henry Wilson of Company F was thought to have been killed there also, but was wounded and captured, losing his leg to amputation. He survived the ordeal and resigned his commission in May 1863.