United States Regiments & Batteries > Maryland
The 3rd Maryland Regiment, Potomac Home Brigade Volunteer Infantry lost 1 officer and 8 enlisted men killed or mortally wounded and 1 officer and 73 enlisted men to disease during the Civil War.
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1861
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| October 31 | Organized at Cumberland, Hagerstown and Baltimore, Md. Assigned to duty as railroad guard on Upper Potomac in Maryland and Virginia attached to Railroad District West Virginia |
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1862
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| January | Assigned to Lander’s Division, Army of the Potomac |
| March | Assigned to Railroad District, Mountain Department |
| April 23 | Action at Grass Lick, Va. |
| May 7 | Wardensville |
| May 10-12 | Franklin |
| June 29 | Moorefield |
| July | Assigned to Railroad Brigade, 8th Army Corps, Middle Department |
| August 11 | Three companies of the 4th Maryland Regiment, Potomac Home Brigade, which had never completed its organization, were assigned to the 3rd Regiment. |
| September 12-15 | Siege of Harper’s Ferry |
| September 15 | The regiment was surrendered along with the rest of the garrison. |
| September 16 | The regiment was paroled and sent to Annapolis, Md., attached to 8th Army Corps |
| September-June | Duty at Annapolis and in the Defenses of Baltimore |
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1863
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| June 28 | Assigned to guard the Washington Branch of the Baltimore & Ohio Railroad at Annapolis, Relay Station, Annapolis Junction and Monocacy |
| July | Assigned to 3rd Separate Brigade, 8th Army Corps |
| October | Assigned to 1st Separate Brigade, 8th Army Corps |
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1864
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| April – May | Companies I and K organized at Ellicott’s Mills and Monrovia |
| July | Operations against Early’s Invasion of Maryland assigned to Kenly’s Independent Brigade, 6th Army Corps, Army of the Shenandoah |
| July 7-8 | Frederick City |
| July 9 |
Battle of Monocacy |
| July | Pursuit of Early |
| July 18 | Snicker’s Gap |
| August 6 | Bolivar Heights |
| August 8 | Halltown |
| August 9 | Charlestown |
| August 13 | Berryville |
| August – May | Duty in the District of Harper’s Ferry, W. Va. assigned to Kenly’s Brigade, Reserve Division, West Virginia |
| May 12 | Ordered to Baltimore, Md. |
| October | Assigned to Reserve Division, West Virginia |
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1865
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| April | Assigned to 1st Brigade, 1st Division, West Virginia |
| May 29 | Mustered out |