17 Fire Attack First, it is easy to set fires; second, it is not easy for the enemy to put out the fire; and third, if your allies are coming to attack the castle at the same time, the enemy will lose any advantage as the fortifications will be understaffed.

If you are going to set fire to the enemy’s castle or camp, you need to prearrange the ignition time with your allies.

—Yoshimori Hyakushu #83

One of the most impactful things a shinobi could do after infiltrating a castle or fortification was start a fire—ideally in or around gunpowder storehouses, wood stores, food or supply depots, or bridges. A well-set fire spread quickly while staying out of sight; could not be contained or extinguished easily; and became an immediate danger to ...

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