Seppuku the head could, both metaphorically and literally, rest in its owner's hands. Those who did not belong to the samurai caste were never ordered or expected to carry out seppuku. Samurai generally could carry out the act only with permission. Sometimes a "daimyō" was called upon to perform seppuku as the basis of a peace agreement. This weakened the defeated clan so that resistance effectively ceased. Toyotomi Hideyoshi used an enemy's suicide in this way on several occasions, the most dramatic of which effectively ended a dynasty of "daimyōs". When the Hōjō were defeated at Odawara in 1590, Hideyoshi insisted
Samurai Warriors 4 , a social spin-off game released on April 22, 2014 for the mobile phones also to commemorate the series' 10th anniversary. Koei Tecmo also collaborated with the Japanese Racing Association (JRA) to release on May 25, 2014 for the PC. "Derby Musou" reuses assets from "Samurai Warriors 4" to create a horse racing game, like that of the "Winning Post" series, with famous Japanese racehorses. Eight characters from "Samurai Warriors 4" make up the playable cast, plus Matthew C. Perry (known in-game as just Perry). The game received a revision, titled , which was released in Japan on February 11,