The 21st trained at Camp Taylor in Cleveland and then moved to Camp Carrington in Gallipolis. They were deployed to the Kanawha River area of (West) Virginia and saw action against the rebel army at Scarey Creek in July, 1861. When the ninety-day 21st came home, James enlisted with other Putnam Co. men in the newly formed 57th O.V.I. He entered as 1st Lt. in Company A. On Feb. 8, 1862, he was promoted to Captain of Co. A and ordered to Camp Chase. The 57th was deployed to western Kentucky and was among the first units to be hit by the Confederate Army at Shiloh. The captain died of a minie ball wound to the chest during the battle. Letters written to his brother William by Col. Mungen on April 10 and by Lt. Col. A.V. Rice on April 13, recounting the events surrounding the captain's death indicate that he was bravely leading his men in the battle.
The family had the captain's remains returned to Ohio, where he is buried beside his parents, his sister Margaret, and two infant siblings in the cemetery in Savannah, Ohio, near where he grew up.