When were the ancient Japanese involved with warfare?

Ancient Japan was involved in warfare from around the Yayoi period (300 BCE to 300 CE), with evidence of tribal conflicts and the emergence of warrior classes. The subsequent Kofun period (300-538 CE) saw the rise of powerful clans and the construction of key burial mounds, indicating increased militarization. The Heian period (794-1185) marked a significant era of samurai warfare, leading to the rise of feudalism and conflicts such as the Genpei War (1180-1185). Warfare continued to evolve in Japan through the subsequent periods, shaping its history and culture.