Abstract
During the Warring States Period, the battle group called Igashu and Kokashu was born in the Domyouchu of the
Kokuzin and Dogo of the Iga and the Koka guns in the Omi-kun, Koka-gun as the core, the crowd subordinate to them and the fellowship mercenary group It consisted of Ashigarushu. The Ashigarushu exercised their own powerful military strengths and even went to other countries to do siege warfare. Igashu and Kokashu resist Oda Nobunaga and try to maintain the domination of Sokokuikii and Gunchuso, but the Koka people lost in Tensho 2 years, the Iga people lost in Tensho 9 years,and are obliged. Toyotomi Hideyoshi will first utilize their military capabilities, but in the intercalary August Tensho 13years, immediately after the suppression of the Kinai neighborhood, we will take measures to separate military farmers and serve as soldiers in other countries, I had to choose whether to do. In Iga and Koka who went out to other countries in search of officials, there were those who served the shogunate like Hattori Masanari and valued with outstanding intelligence ability, and some clans were invited. Their actual situation is an intelligence group that bundles lower class samurai in the class, which will be recognized as a ninja organization.
