Japanese castle defense tricks, Masugata

Masugata means literally a square measuring box (see masu), and from an architectural point of view, it is one of the most complex defensive tricks used by the Japanese castle builders.

You can see an example of this defensive architecture in today's photo, taken inside the Kanazawa castle: the masugata complex includes two gates, the external gate on the right (a simpler, Koraimon type of gate), and the internal gate, larger and more complex (Yaguramon type) on the left. The rectangular space between the gates was used as a place to gather the defending troops, in order to initiate a surprise attack, and it was also a trap for the attackers, blocking their troops after conquering the first gate.