2 Guarding with Special Care Even castles with strong fortifications should be guarded, paying particular attention to the recessed corners.
What shinobi should keep in mind when stealing into a castle or camp are the naturally fortified and difficult directions, the woods, and blind spots.
—Yoshimori Hyakushu #10
Shinobi were historically proficient infiltrators. The ancient scrolls describe how to quickly identify and brutally exploit weak spots in an enemy’s fortifications. The scrolls also stress that shinobi should use higher-order thinking to creatively apply their knowledge when building their own defenses. Bansenshūkai advises commanders tasked with defending a camp or castle to identify, inspect, and guard with special care the ...
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