博多湾
The , or Bun'ei Campaign, also known as the First Battle of Hakata Bay, was the first attempt by the Mongol-led Yuan dynasty of China to invade Japan. After conquering the Japanese settlements on Tsushima and Iki islands, Kublai Khan's fleet moved on to Japan proper and landed at Hakata Bay, a short distance from Kyūshū's administrative capital of Dazaifu. Despite the superior weapons and tactics of the Yuan forces, those that disembarked at Hakata Bay were grossly outnumbered by the samurai force; the Japanese had been preparing, mobilizing warriors and reinforcing defenses since they heard of the defeats at Tsushima and Iki. The Japanese defenders were aided by major storms which sunk a sizable portion of the Yuan fleets. Ultimately, the invasion attempt was decisively repulsed shortly after the initial landings.