Ninja were professional spies during the age of the samurai. Their origins go back to the twelfth century, when the samurai class began to gain power. When the scale of fighting increased in the fourteenth century, it became necessary to conduct espionage activities against enemy forces, and ninja became even もっと見る active.
Ninja were called upon によって their feudal lords to gather information, plunder the enemy's 食 and weapon supplies, and lead the way in nighttime attacks. They received specialized training and were 与えられた special duties. Ninja remained active until the beginning of the Edo period...
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