After the Sengoku period (Japan), when ashigaru began to be recognized as a new fighting force, the military system of Sengoku daimyo (Japanese territorial lord in the Sengoku peiord) shifted to that in which defense was regarded as a fundamental.
戦国時代(日本)以降、足軽が新たな戦闘力として認識されると、戦国大名の軍制は備を基本としたものへ変貌した。