Herkner enlisted in Grand Rapids as a 1st Lt. age 21 and received a promotion to Captain 1/1/1864. He musters out with the regiment 9/22/1865 in Bentonville N.C. He participated in battles of Lavergne, Corinth, Savannah and Bentonville. After the war he returned to Grand Rapids and started a jewelry business which still exists. He is buried at Fulton Street Cemetery.