[2][4] By December 23, 1944, Biddle was serving in Europe as a private first class in Company B of the 1st Battalion, 517th Parachute Infantry Regiment; which was attached to the 82nd Airborne Division at the time.

After recovering in England for several weeks, he headed back to his unit and on the way learned through an article in Stars and Stripes that he would be awarded the Medal of Honor.

[6] For his actions during the battle near Soy, Biddle was awarded the Medal of Honor at the White House on October 30, 1945, by President Harry Truman.

[2][8] Biddle's official Medal of Honor citation reads: He displayed conspicuous gallantry and intrepidity in action against the enemy near Soy, Belgium, on 23 and 24 December 1944.

He then located the approximate position of a well-concealed enemy machine-gun nest, and crawling forward threw hand grenades which killed two Germans and fatally wounded a third.

At daybreak he again led the advance and, when flanking elements were pinned down by enemy fire, without hesitation made his way toward a hostile machine-gun position and from a distance of 50 yards killed the crew and 2 supporting riflemen.

Biddle's intrepid courage and superb daring during his 20-hour action enabled his battalion to break the enemy grasp on Hotton with a minimum of casualties.