The 9th Maryland Volunteer Infantry Regiment lost 2 enlisted men killed and mortally wounded and 124 enlisted men to disease during the Civil War.

1863
June – July	Organized at Baltimore, Md. for six months service
July 6	Moved from Baltimore to Western Maryland. Attached to 1st Brigade, Maryland Heights, Division of West Virginia
July 7	Occupation of Maryland Heights
July	At Loudon Heights. Guard duty on Baltimore & Ohio Railroad. Company “B” at Duffield Station, Company “C” at Brown’s Crossing, Companies “A” and “B” provost duty at Harper’s Ferry, Companies D, E, F, G, H and I at Charleston, W. Va.
October 18	Companies D, E, F, G, H and I attacked by Imboden and captured with the rest of the Charleston garrison.
October-February	Companies A, B and C on duty in West Virginia
December	Assigned to 1st Brigade, 1st Division, West Virginia
1864
February 24	Moved to Baltimore, Md., and mustered out