The Bansenshukai shinobi manual warns shinobi not to attempt to gain fame for their skills, as the more known an agent becomes due to his expert skills, the greater the chance of him being detected by the enemy. Detection was a real issue as political alliances changed throughout the Sengoku period. Later in the Edo period, Chikamatsu wrote that his Koka master, Kimura, said that some lords did not fully understand how to use shinobi and how to run shinobi teams.