An 1864 inspection by Brig. Gen. Albion P. Howe, Inspector-General of Artillery, found Fort Stanton to be well-equipped, but the garrison poorly trained. The fort was armed with six 32-pounder barbettes, three 24-pounder field howitzers, four 8-inch siege howitzers, one Coehorn mortar, and one 4-inch rifled mortar. The ammunition was listed as "complete and servicible," but the 131 men of a single company of the Heavy Massachusetts Volunteer Artillery that comprised the garrison at the time were "not drilled in artillery; some in infantry."