Ashigaru infantry system

Timeline

1. c. 1400–1550Japanese archipelago · JapanFrom the Muromachi period onward, peasant farmers and servant classes within daimyo domains served as auxiliary infantry in wartime, poorly equipped and loosely organized; after the Ōnin War, with warfare endemic, daimyo across the country increasingly relied on ashigaru for scouting, fortification, and field battles, but no unified military system had yet formed.
2. 1568–1570Kinai and Owari · KinaiOda Nobunaga organized ashigaru into tai-kumi (unit-squad) formations, uniformly issued long spears and firearms, and established military commissioners (gunbugyō) to handle conscription and rewards and punishments; after his entry into Kyoto in 1568 he expanded and prepared his forces, and around the 1570 Battle of Ishiyama Hongan-ji the ashigaru had become a mainline infantry force on par with mounted samurai, marking the completion of institutional management.
3. 1575–1590Nagashino and the Shitaragahara plain · Mikawa ProvinceAt the 1575 Battle of Nagashino, Nobunaga's army used three thousand ashigaru arquebusiers firing in rotating volleys to rout the Takeda cavalry, demonstrating the tactical power of combining ashigaru with firearms; thereafter the Toyotomi regime mobilized ashigaru on a massive scale in every campaign, their status rising from auxiliary troops to the decisive factor in the outcome of war.