5921484 Challenger tank (A30) crossing a Bailey bridge near Esch, Luxembourg, 27 October 1944 (b/w photo) by Unknown photographer, (20th century); National Army Museum, London; (add.info.: Challenger tank (A30) crossing a Bailey bridge near Esch, Luxembourg, 27 October 1944. Photograph, World War Two, North West Europe (1944-1945), 1944. The Cruiser Tank Mk VIII Challenger (A30) was produced in relatively small numbers as a stop-gap response to the threat posed by German heavy tanks. Fitted with a powerful 76 mm gun its primary role was as a tank destroyer. Production was limited as the Sherman Firefly quickly assumed this role within the Allied armoured formations.); by National Army Museum ; out of copyright.