In August 1861, he became brigadier general of volunteers, and was brevetted lieutenant colonel in the Regular Army for his gallantry at the Battle of White Oak Swamp in the Seven Days Battles.
In August 1861, he became brigadier general of volunteers after helping organize the First Vermont Brigade. He was brevetted lieutenant colonel in the Regular Army for his gallantry at the Battle of White Oak Swamp in the Seven Days Battles.