William F. Fox, Lt. Col. U. S. V., Regimental Losses in the American Civil War, 1861-1865: A Treatise on the extent and nature of the mortuary losses in the Union regiments, with full and exhaustive statistics compiled from the official records on file in the state military bureaus and at Washington

Twelfth New Hampshire Infantry.

181 killed == 12.4 per cent.

Of the 1,024 originally enrolled, 143 were killed == 13.9 per cent. Total of killed and wounded, 659.

Present, also, at Swift Creek; Fall of Richmond.

notes.--Organized at Concord, N. H., September 10, 1862, the ten companies having been recruited within ten days time, and arrived at Arlington Heights, Va., on September 30th. The heaviest loss in the battle of Chancellorsville fell to the lot of the Twelfth New Hampshire; it fought there in Whipple's Division, Third Corps. In the fighting on Sunday morning it faced for a long time a musketry fire of extraordinary severity, and having held its position long after the troops on either side had fallen back, it retired slowly and in good order to avoid capture. It entered that engagement with 2 officers and 537 men, (official report) losing 41 killed, 213 wounded, and 63 missing; total, 317. The most of the missing were killed or wounded men who were left on the field and fell into the hands of the enemy. At Gettysburg, 21 officers and 224 men went into action, sustaining a loss of 14 killed, 67 wounded, and 11 missing. Soon after this battle, the Twelfth, in company with the Second and Fifth New Hampshire, was assigned to duty at Point Lookout, Md., as guards at the military prison, remaining, there eight months. The regiment received in the meanwhile an assignment of 450 conscripts and mercenaries, over 100 of whom deserted on their way to the front. When the Twelfth took the field in 1864, it was in Wistar's Brigade, Weitzel's (2d) Division, Eighteenth Corps. At Cold Harbor it lost 23 killed, 126 wounded, and 15 missing, out of less than 300 men engaged in the assault. In December, 1864, it was placed in Donohoe's Brigade, Devens's Division, Twenty-fourth Corps. This brigade was the first infantry command that entered Richmond. The adjutant-general of New Hampshire states in his official report that “no regiment left the state with men of finer personal appearance, or of more gentlemanly bearing.”