His finest performance came on March 8, 1862, at the Battle of Pea Ridge, where he commanded two divisions and personally directed the Union artillery in the defeat of Maj. Gen. Earl Van Dorn on the second day of the battle.
Hans fineste indsats kom den 8. marts 1862 i Slaget ved Pea Ridge, hvor han ledede to divisioner og personligt styrede Unionens artilleri i sejren over generalmajor Earl Van Dorn på andendagen af slaget.