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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1863-06-30 Benjamin Bean and other selectmen of Montville request the discharge of Oren A. Sidelinger due to illness of wife
Benjamin Bean, Gorham Clough, and Ward Nason
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1863-07-03 Colonel Daniel Chaplin and Captain W.S. Clark recommend Corporal Charles Sawyer for promotion
Daniel Chaplin and W. S. Clark
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1863-07-24 Captain John Atwell and Colonel Chaplin recommend George Oakes for promotion
Daniel Chaplin and John Atwell
![1863-06-30 Muster, descriptive roll, and clothing account of recruits through June 4, 1863 [not digitized] by Adjutant General](https://digitalmaine.com/cw_me_1st_heavy_corr/1089/thumbnail.jpg "1863-06-30 Muster, descriptive roll, and clothing account of recruits through June 4, 1863 [not digitized] by Adjutant General")
