The First Maine Heavy Artillery Regiment was mustered August 21, 1862 as part of the 18th Maine Regiment and reorganized December, 1862 as First Maine Heavy Artillery. They mustered out September 11, 1865. This regiment of 900 men sustained the greatest loss in battle, suffering 632 casualties in about 15 minutes during the Siege of Petersburg, more than any Union regiment losses in a single day of combat throughout the war.
They served in the following engagements:
- Defense of Washington - Sept. 1862 to May 1864
- Fredericksburg Pike, VA - May 19, 1864
- Milford Station - May 20, 1864
- North Anna, VA - May 23, 1864
- Totopotomy, VA - May 26, 1864
- Cold Harbor, VA - May 31, 1864
- Petersburg, VA - June 18, 1864
- Jerusalem Plank Road, VA - June 22 - 23, 1864
- Deep Bottom, VA - August 18, 1864
- Boydton Plank Road, VA - October 27, 1864
- Weldon Railroad, VA - December 7, 1864
- Hatchers Run, VA - February 5, 1865
- Sailors Creek, VA - April 6, 1865
- Farmville, VA - April 7, 1865
- Appomattox, VA - April 8, 1865
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1864-01-14 Provost Marshal (4th District) Elijah Low and other officers oppose Captain Crossman's promotion to Major
Elijah Low, A. A. Wing, Jason Weeks, William P. Wingate, and S. P. Strickland
![1864-01-23 Davis R. [?] recommends Captain Crossman for promotion](https://digitalmaine.com/cw_me_1st_heavy_corr/1175/thumbnail.jpg "1864-01-23 Davis R. [?] recommends Captain Crossman for promotion")
