Organized at Milwaukee, Wis., and mustered into State service April 27, 1861. Mustered into United States service May 17, 1861. Left state for Harrisburg, Pa., June 9. Attached to Abercrombie's 6th Brigade, Negley's 2nd Division, Patterson's Army. Camp at Hagerstown till June 29. Moved to Williamsport, Md., June 29-July 1. Action at Falling Waters July 2. Moved to Martinsburg July 3. Duty at Charlestown, Harper's Ferry and guarding fords of the Monocacy River till August. Edwards' Ferry, Md., July 29. Mustered out August 21, 1861.