Panzerkampfwagen VIII Maus (English: 'mouse') was a German World War II super-heavy tank completed in late 1944. It is the heaviest fully enclosed armored fighting vehicle ever built. Five were ordered. 220 mm (8.7 in) (turret front)[1] 200 mm (7.9 in) (turret side and rear)[1] 200 mm (7.9 in) (hull front)[1] 180 mm (7.1 in) (hull side)[1] Main armament 128 mm (5 in) KwK 44 gun L/55 (68 rounds)[1] Secondary armament 75 mm (3 in) KwK 44 gun L/36.5 (co-axial, 100 150 mm (5.9 in) (hull rear)[1]