He served in Company F of the 97th New York Infantry Regiment during the American Civil War. Unfortunately, the specific details about his experience or the circumstances surrounding his service are not available. Nevertheless, soldiers like Mosher played an essential role in the various engagements and campaigns throughout the war. The 97th New York Infantry Regiment, also known as the Conkling Rifles, was organized in Boonville, New York, in early 1862. They participated in numerous battles, including the Peninsula Campaign, the Second Battle of Bull Run, the Battle of Antietam, the Battle of Fredericksburg, the Battle of Gettysburg, and the Battle of the Wilderness, among others. The regiment was involved in various campaigns and theaters of the war until they were mustered out in August 1865.As a member of the 97th New York Infantry Regiment, Private Mosher would have likely participated in some of these significant battles, facing the challenges and dangers of war.