元寇
Land-owning samurai, together with peasant foot soldiers, fought in many wars and conflicts including the Mongol invasions of Japan in 1274 and 1281. Constant warfare between the 14th and 16th centuries made the hiring of foot soldiers with no particular loyalty necessary at times. Paid only in loot, these mercenaries were not well-trained and thus could not always be depended upon in battle. These wandering foot soldiers eventually became the "ashigaru".