The 5th Heavy Artillery lost 3 enlisted men killed and 46 to disease in the Civil War.
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1864 |
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| August and September | Organized as the 204th Volunteers at Pittsburg under Colonel George S. Gallupe, Lt. Colonel Joseph Browne and Majors Michael Baer, George Irwin and Howard Morton |
| September | Ordered to Washington, D.C. |
| September | Attached to District of Alexandria, 22nd Corps. Duty in Northern Defenses of Washington, D. C., and along Manassas Gap Railroad, protecting supplies for Sheridan, and constantly engaged with Mosby. |
| October 4 | Action at Salem |
| October 7 | Rectortown |
| October 11 | White Plains |
| October and November | Destruction of Manassas Gap Railroad |
| October 27 | Major Morton discharged |
| November | Assigned to 1st Separate Brigade, 22nd Corps
Duty in the Northern Defenses of Washington: 1st Battalion at Prospect Hill 2nd Battalion at Vienna 3rd Battalion at Fairfax C. H. |
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1865 |
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| Spring | Duty on Bull Run battlefield burying nearly 2,000 dead. |
| May 10 | Captain William Hope of Battery A promoted to major |
| June | Ordered to Pittsburg for muster out. |
| June 30, 1865 | Mustered out under Colonel Gallupe, Lt. Colonel Browne and Majors Baer, Hope and Irwin |