 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 in length bordering the coast of Hakata Bay in what is now the city of Fukuoka.