18 Covert Communication When a shinobi is going to communicate with the general after he has gotten into the enemy’s castle, the shinobi needs to let his allies know where he is. It is essential to arrange for the time and place to do this.
For success on a night attack, send shinobi in advance to know the details of the enemy’s position before you give your orders.
—Yoshimori Hyakushu #12
Because shinobi were first and foremost experts in espionage, they had to safely relay secret messages containing scouting reports, attack plans, and other critical information to help their lords and allies make informed tactical and strategic decisions. Similarly, lords, generals, and other shinobi needed to covertly tell an infiltrated shinobi when ...
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