Ninjutsu
Training
The skills required of the ninja have come to be known in modern times as ninjutsu (忍術), but it is unlikely they were previously named under a single discipline, rather distributed among a variety of espionage and survival skills. Some view ninjutsu as evidence that ninja were not simple mercenaries because texts contained not only information on combat training, but also information about daily needs, which even included mining techniques. The guidance provided for daily work also included elements that enable the ninja to understand the martial qualities of even the most menial task. These factors show how the ninjutsu established among the ninja class the fundamental principle of adaptation.
Training
!This diagram from the [Bansenshūkai uses divination and esoteric cosmology (onmyōdō) to instruct on the ideal time for taking certain actions.](//upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Bansenshukai-v8-diagram.jpg/250px-Bansenshukai-v8-diagram.jpg)
Training
The first specialized training began in the mid-15th century, when certain samurai families started to focus on covert warfare, including espionage and assassination. According to Turnbull, the ninja was trained from childhood, as was also common in samurai families.
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