In the Sengoku Period (Period of Warring States), vassals (lower-ranked samurai) of a warring lord came to approach matters in unity in order to perform service at ordinary times and do military service for their master's house.
戦国時代(日本)に入ると、戦国大名の家臣（下級武士）たちは、主家への平時の奉公や軍役をこなすために相互に団結して事に当たるようになった。