George Henry Thomas
On September 19, 1861, Seaman volunteered for service in the Union Army and was enrolled as a private in Company H, 1st Wisconsin Volunteer Infantry Regiment. After a year, he was promoted to Corporal, and eventually Sergeant. When the regiment mustered out in October 1864, Sergeant Seaman continued his service as a quartermaster on the staff of General George Henry Thomas through the end of the war.