NINJA HISTORY
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It was not until the 15th century that spies were specially trained for their purpose.[15] It was around this time that the word shinobi appeared to define and clearly identify ninja as a secretive group of agents. Evidence for this can be seen in historical documents, which began to refer to stealthy soldiers as shinobi during the Sengoku period.[21] Later manuals regarding espionage are often grounded in Chinese military strategy, quoting works such as The Art of War (Sunzi Bingfa), by Sun Tzu.[22]

The ninja emerged as mercenaries in the 15th century, where they were recruited as spies, raiders, arsonists and even terrorists. Amongst the samurai, a sense of ritual and decorum was observed, where one was expected to fight or duel openly. Combined with the unrest of the Sengoku era, these factors created a demand for men willing to commit deeds considered not respectable for conventional warriors.[1][2] By the Sengoku period, the shinobi had several roles, including spy (kanchō), scout (teisatsu), surprise attacker (kishu), and agitator (konran).[21] The ninja families were organized into larger guilds, each with their own territories.[23] A system of rank existed. A jōnin ("upper man") was the highest rank, representing the group and hiring out mercenaries. This is followed by the chūnin ("middle man"), assistants to the jōnin. At the bottom was the genin ("lower man"), field agents drawn from the lower class and assigned to carry out actual missions