He commanded the SS Division Wiking during World War II. Gille was a recipient of the Knight's Cross of the Iron Cross with Oak Leaves, Swords and Diamonds, making him the most highly decorated Waffen-SS member of the war. After the war, Gille became active in HIAG, a lobby group and a revisionist veteran's organisation founded by former high-ranking Waffen-SS personnel in West Germany in 1951.