The Akutagawa Kaden manual claims a shinobi must learn to imitate animal sounds during infiltration so that the people indoors would ignore any movement outside. Both the Giyoshu military manual and the Shoninki shinobi manual advise paying attention to the shadows made by the moonlight, and taking cover in even the smallest shadow. They also mention the use of the kaginawa grappling hook and using a katana or wakizashi as a foothold when climbing.