John Sullivan

He mustered into service on 6 November 1861 as Private, Independent Battery C, Pennsylvania Light Artillery.

He was wounded in action at Antietam on 17 September 1862:

Another strange incident of this engagement was that Private Michael [sic] Sullivan while carrying a shell from the limber chest to the gun, a Confederate shell exploded near him, the flash of which ignites the fuse in the shell he was carrying, it exploded tearing all his clothes off and wounding him severely. he got well, though never able to return to the service.

He was discharged on a Surgeon's certificate, date unknown.

Basic information from Bates1. The quote above from Captain Thompson's History of the Battery in Pennsylvania at Gettysburg: Ceremonies at the Dedication of the Monuments by the Commonwealth of Pennsylvania to Mark the Positions of the Pennsylvania Commands Engaged in the Battle (Volume II, 1893).