Jones enlisted in Company E of the
8th Illinois Cavalry on August 5, 1861. He was commissioned a second lieutenant on December 5, 1862, first lieutenant July 4, 1864, and captain on October 10, 1864. All three commissions were signed by Illinois Governor
Richard Yates. On July 1, 1863, at Gettysburg, Jones commanded one of the regiment's sentry posts on the Chambersburg Pike, the road
Robert E. Lee's Confederate army used to march from
Cashtown to Gettysburg. About 7:30 a.m., Jones noticed a cloud of dust on the road to the west, indicating that the
Confederates were approaching. At that point, Jones borrowed Corporal Levi S. Shafer's carbine, aimed it with the assistance of a fence rail, and fired a shot at "an officer on a white or light gray horse." ==Post-war life and death==