Statistics for occurrence #1 of “Washington, D. C.” in chapter 27, regiment NH1HvArtillery of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

...to October 17, 1864. Company M formed by assignment of 1st New Hampshire Battery, Volunteer Light Artillery, November 5, 1864, but remained detached as a Light Battery. Each Company ordered to Washington, D. C. , as fast as organized, and duty in the Defenses of that city till June, 1865. Regiment mustered out June 15, 1865. Recruits consolidated to 2 Companies and mustered out September 11, 1865.
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