1^st Massachusetts Volunteer Heavy Artillery

This unit was formed in July 1861. The unit saw action as the 1^st Massachusetts Heavies were attached as 2^nd Brigade, 3^rd Division, II Corps of the Army of the Potomac. The unit fought at:

• Spotsylvania 19 May 1864
• Totopotomy, Cold Harbor, Petersberg 16-22 Jun 1864