Bushidan (warrior bands) refers to the group of bushi (samurai) that existed mainly from the late Heian, Kamakura, the period of the Northern and Southern Courts (Japan) (Japan), and lasted until the Muromachi period.
武士団（ぶしだん）とは主に平安時代後半から、鎌倉時代、南北朝時代(日本)を中心に室町時代までの武士の集団を指す。