The regiment participated in the Atlanta Campaign followed by Franklin and Nashville, and then participated in Sherman's Carolina Campaign and the final battles at Bentonville and Averasboro.
For some unknown reason, they did not participate in the Grand Review in Washington, but were mustered out in late May, 1865 and returned home by rail.
With a total enrollment of 1,417, the 23rd had 41 men killed in action, 8 died of wounds and 228 of disease for a total casualty rate of 20%.
Company A - Clinton County
Company B - Saginaw County
Company C - Genesee County
Company D - Tuscola County
Company E - Saginaw County and Alcona County
Company F - Bay County and Huron County
Company G - Clinton County
Company H - Kent County and Shiawassee County
Company I - Houghton County and Kalamazoo County
Company K - Genesee County
Unassigned Company - Genesee County