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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1863-12-16 Joseph R. Mears and Israel Woodbury of Morrill recommend Richard B. Creasey for lieutenant
Joseph R. Mears and Israel Woodbury
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1863-12-25 Edward King, Benjamin Legacy, and Thomas Callagan of Princeton request to be credited on the town quota
Edward King, Benjamin Legacy, and Thomas Callagan
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1863-12-28 Colonel Daniel Chaplin and others recommend Captain W. Clarke for promotion
Daniel Chaplin, Hannibal Hamlin, and Lewis Morris
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1864-01-11 Joshua Watson and other Selectment of Sedgwick request promotion of Sergeant H. Spooner
Joshua Watson, William H. Sargent, and Isaac Allen
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1864-01-13 Colonel Chaplin recommends promotions and Governor Samuel Cony concurs
Daniel Chaplin and Samuel Cony