The 1st Michigan Cavalry was organized at Detroit, Michigan, between August 21 and September 6, 1861. Among the initial officers was William d'Alton Mann, a future prominent Michigan newspaper and magazine publisher. It was a part of the famed Michigan Brigade, commanded for a time by Brigadier General George Armstrong Custer. The 1st fought throughout the war in Virginia. Over the span of its existence, it carried a total of 2705 men on its muster rolls. It suffered 14 officers and 150 enlisted men killed in action or mortally wounded and 6 officers and 244 enlisted men who died of disease, for a total of 414 fatalities. It was mustered out of service on September 12, 1865. Companies of The Michigan 1st Cavalry Regiment Company A - Wayne County Company B - Marquette County Company C - Wayne County Company D - Clinton County Company E - Ypsilanti, Washtenaw County, Michigan and Toledo, Lucas County, Ohio Company F - Lapeer County Company G - Wayne County and Oakland County Company H - Wayne County Company I - Kalamazoo County Company K - Wayne County Company L - Macomb County Company M - Cass County and Kalamazoo County Unassigned Company - Wayne County