21 Circumstances of Infiltration You should infiltrate at the exact moment that the enemy moves and not try when they do not move—this is a way of principled people.
In heavy rainfall, when the rain is at its most, you should take advantage of it for your shinobi activities and night attacks.
—Yoshimori Hyakushu #1
The Ninpiden and Bansenshūkai both advise that when moving against a target, shinobi should use cover to go undetected. They may wait for circumstances in which cover exists or, if necessary, create those circumstances themselves. The scrolls provide a wide range of situations that can aid infiltration, from natural occurrences (strong winds and rain) to social gatherings (festivals, weddings, and religious services) to shinobi-initiated ...
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