1st New Hampshire Heavy Artillery in the American Civil War

1863
July 22	Company A was organized as the 1st Company New Hampshire Heavy Artillery and mustered in. Stationed at Fort Constitution
September 17	Company B was organized as the 2nd Company New Hampshire Heavy Artillery and mustered in. Stationed at Fort McClary, Kittery Point
1864
May 6	Companies A and B were ordered to Washington, D.C. They were attached to Augur’s Command, Defenses of Washington, 22nd Corps, and assigned to duty in the Defenses of Washington, D.C. Company A was at Forts Slocum, Stevens, Totten, Sumner and Batteries Cameron, Parrott, Kendall and Vermont. Company B was at Forts Bunker Hill, Saratoga, Lincoln, Bayard, Gaines and Foote.
July 11-12	Companies A and B repulsed Early’s attack on Washington
September 2 – October 17	Companies C – L were organized and ordered to Washington, D.C. for duty in the Defenses of the city as soon as they were organized .
November 5	Company “M” was formed by assignment of 1st New Hampshire Battery, Volunteer Light Artillery, but it remained detached and equipped as a Light Battery.
November 25	Company A was ordered to Portsmouth Harbor, New Hampshire
1865
February	Company B was ordered to Portsmouth Harbor, New Hampshire
June	The 1st New Hampshire Heavy Artillery mustered out. Recruits were consolidated to 2 Companies.
September 11	Recruits were mustered out