On that day, at Vagney, France, he commanded an M4 Sherman tank in a hunt for an enemy raiding party which had infiltrated Allied lines.
Second Lieutenant Harris' official Medal of Honor citation reads: For conspicuous gallantry and intrepidity at risk of life above and beyond the call of duty on 7 October 1944, in Vagney, France.
At 9 p.m. an enemy raiding party, comprising a tank and 2 platoons of infantry, infiltrated through the lines under cover of mist and darkness and attacked an infantry battalion command post with hand grenades, retiring a short distance to an ambush position on hearing the approach of the M-4 tank commanded by 2d Lt. Harris.
Realizing the need for bold aggressive action, 2d Lt. Harris ordered his tank to halt while he proceeded on foot, fully 10 yards ahead of his 6-man patrol and armed only with a service pistol, to probe the darkness for the enemy.
Although struck down and mortally wounded by machinegun bullets which penetrated his solar plexus, he crawled back to his tank, leaving a trail of blood behind him, and, too weak to climb inside it, issued fire orders while lying on the road between the 2 contending armored vehicles.