When it became the Sengoku period (period of warring states), samurai warriors and local ruling clans struggled with each other seeking to expand their influence, resulting in Kaido being used as traffic routes for transferring troops and transporting supplies.
武士・豪族が群雄割拠する戦国時代(日本)となると、兵の移動や物資の輸送のための交通路として利用されている。