After entering the Edo period, the Edo bakufu (Japanese feudal government headed by a shogun) and military organization placed in each domain ceased to experience war for about 250 years as Japan became peaceful.
江戸時代に入り、天下泰平の世になると江戸幕府や各藩に置かれた軍制は約250年間戦争を経験しないまま存続した。