A phony crane and deckhouse on the aft section hid two of the 150 mm guns; the other four guns were concealed via flaps in the side Muggenthaler, August Karl German Raiders of World War II Prentice-Hall, 1977, , p16 Rogge, Bernhard The German Raider Atlantis, Ballantine, 1956 46 that were raised when action was imminent. ''