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Mongol invasions (1274–1281)

Kublai Khan of the Mongol Empire turned his attention towards Japan starting in 1268, exerting a new external pressure on Japan with which it had no experience. Kublai Khan first sent an envoy to Japan to make the Shogunate acknowledge Khan's suzerainty. The Kamakura shogunate refused. Mongolia repeatedly sent envoys thereafter, each time urging the Shogunate to accept their proposal, but to no avail.

In 1274, Kublai Khan mounted an invasion of the northern part of Kyushu with a fleet of 900 ships and 33,000 troops, including troops from Goryeo on the Korean Peninsula. This initial invasion was compromised by a combination of incompetence and severe storms. After the invasion attempt of 1274, Japanese samurai built a stone barrier 20 km (12 mi) in length bordering the coast of Hakata Bay in what is now the city of Fukuoka. The wall, 2–3 metres in height and having a base width of 3 meters, was constructed between 1276 and 1277, and was excavated in the 1930s.

Kublai sent another envoy to Japan in 1279. At that time, Hōjō Tokimune of the Hōjō clan (1251–1284) was the Eighth Regent. Not only did he decline the offer, but he beheaded the five Mongolian emissaries after summoning them to Kamakura. Infuriated, Kublai organized another attack on Fukuoka Prefecture in 1281, mobilizing 140,000 soldiers and 4,000 ships. The Japanese defenders, numbering around 40,000, were no match for the Mongols and the invasion force made it as far as Dazaifu, 15 km (9 mi) south of the city of Fukuoka. However, the Japanese were again aided by severe weather, this time by a typhoon that struck a crushing blow to the Mongolian troops, thwarting the invasion.

It was this typhoon that came to be called the Kamikaze (Divine Wind), and was the origin of the term Kamikaze used to indicate suicide attacks by military aviators of the Empire of Japan against Allied naval vessels during World War II.