Born in Sweden, Gibson immigrated to the United States and joined the Army from Chicago, Illinois in February 1941.
On that day, in Cisterna di Latina area near Isolabella, Italy, he was placed in command of a squad during an advance down a streambed.
Gibson led his men from the front, repeatedly advancing ahead of the squad and three times attacking German positions alone.
Technician Fifth Grade Gibson's official Medal of Honor citation reads: For conspicuous gallantry and intrepidity at risk of life above and beyond the call of duty.
Despite all warning, Gibson crawled 125 yards through an artillery concentration and the cross fire of 2 machineguns which showered dirt over his body, threw 2 hand grenades into the emplacement and charged it with his submachine gun, killing 2 of the enemy and capturing a third.