 Sumner commanded the II Corps during the Maryland Campaign and later the Right Grand Division of the Army of the Potomac during the Fredericksburg Campaign.Following the Battle of Fredericksburg, he resigned his command in January 1863 and was to be transferred to command the Department of the Missouri, but died of a heart attack en route on March 21, 1863.Other important generals from Massachusetts included Maj. Gen. Darius Couch, who commanded the II Corps and the Department of the Susquehanna, Maj. Gen. John G. Barnard, who organized the defenses of Washington, DC and became Chief Engineer of the Union Armies in the field, and Maj. Gen. Isaac Stevens, who had graduated first in his class at West Point and commanded a division of the IX Corps.