1861
Organized at Racine, Wis.
July 2 Mustered in
July 15-22 Moved to Baltimore, Md. Attached to Dix’s Division, Baltimore, Md. to Guard railroad near Baltimore
November 14-22 Expedition to eastern shore of Maryland.
1862
December-February Duty at Baltimore
February 19 Moved to Fortress Monroe, Va., then sailed on Steamer Constitution for Ship Island, Miss., and the capture of New Orleans. Spent remainder of service in the Western Theater.
1863
August Redesignated 4th Wisconsin Cavalry Regiment