 The main battery was the same as previously (six /47 caliber guns in dual turrets), while the secondary battery was split between six paired /48 caliber anti-surface guns and paired /65 caliber anti-aircraft guns because German designers had not been able to develop a satisfactory dual-purpose gun.Light anti-aircraft guns were eight 37 mm in four dual mounts and twenty 20 mm autocannon in single mounts.Twelve torpedo tubes finished out the armament aboard the ships.