Mustered into service as a Private on July 29th, 1861
Private McCollins was slightly wounded in the hip at the Battle of Brawner Farm on August 28th, 1862.
By the fall of 1864 the ranks of the 19th Indiana were so depleted from combat casualties and sickness they were folded into the 20th Indiana Infantry. John was put into Company I of this regiment and served there until the end of the war mustering out on July 12th, 1865.
He would file for a pension in 1878. John's wife Elizabeth would file for a "widows" pension in July of 1887 while living in Missouri.
John also went by the alias "John Collins" and "John McCollin".
His burial location is currently unknown.