Private John Dupuy was mustered into Confederate service on April 25th, 1862 when he was enlisted as a Private in Captain Smith’s Company (Key West Avengers), 7th Regiment Florida Infantry by Major R. B. Thomas at Tampa, Florida for a period of 3 years or the war.

He was reported present until November 3, 1862 when he was recorded as absent sick in hospital at Knoxville, Tennessee. He was again present for duty from at least February 7, 1863 until February 25, 1864 when he was wounded in action during the first Battle of Dalton, Georgia. He had been officially transferred to the Confederate States Navy the day he received his mortal wound.

He was visited in the Fairground Hospital #2 in Atlanta by many of his Company K comrades on March 6, 1864, at which time Sgt. Watson of his company recorded he was “in good spirits and doing well.”

Dupuy died at Atlanta Fairground Hospital #2, Atlanta, Georgia on March 7, 1864. He is the only known combat-related fatality among the personnel of Company K during active service.