The 9th Maryland Volunteer Infantry Regiment lost 2 enlisted men killed and mortally wounded and 124 enlisted men to disease during the Civil War.
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1863
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| 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 |
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1864
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| February 24 | Moved to Baltimore, Md., and mustered out |