[1] At the Battle of Pea Ridge in Arkansas, on March 7, 1862, Carr led the 4th Division of the Army of the Southwest in the fighting around Elkhorn Tavern.

According to the official citation, Carr had "directed the deployment of his command and held his ground, under a brisk fire of shot and shell in which he was several times wounded.

"[3] On April 30, 1862, President Abraham Lincoln appointed Carr brigadier general of volunteers, to rank from March 7, 1862.

Eventually, Carr commanded the Cavalry Division in the VII Corps during Frederick Steele's Camden Expedition.

His final assignment of the war was to command of the 3rd Division of the XVI Corps in preparation for the Union campaign against Mobile, Alabama, where he subsequently fought in the Battle of Fort Blakeley.

[5] Subsequently, Carr stayed in the Regular Army and conducted successful operations on the frontier against the Indians, winning a significant battle at Summit Springs.

Citation: Directed the deployment of his command and held his ground, under a brisk fire of shot and shell in which he was several times wounded.