Rock Chutes

Almost every corner of the yagura and especially the main keep that sit atop stone walls and foundations are guarded with a rock chute because that is the easiest place for an attacker to climb up. The picture above is of a rock chute on a section of yagura at Nihonmatsu-jo.

More Photos
Rock chutes were used to protect castles from invaders scaling the walls Rock chute at Nihonmatsu-jo
Rock chute at Hamamatsu-jo Rock chute at Matsumoto-jo