quality:corruption, stylistic:tone, information:extraction
Invasions of Japan

Within Kublai's court his most trusted governors and advisers appointed by meritocracy with the essence of multiculturalism were Mongol, Semu, Korean, Hui and Han peoples. Because the Wokou extended support to the crumbling Southern Song dynasty, Kublai Khan initiated invasions of Japan.

Kublai Khan twice attempted to invade Japan. It is believed that both attempts were partly thwarted by bad weather or a flaw in the design of ships that were based on river boats without keels, and his fleets were destroyed. The first attempt took place in 1274, with a fleet of 900 ships.

The second invasion occurred in 1281 when Mongols sent two separate forces: 900 ships containing 40,000 Korean, Han, and Mongol troops were sent from Masan, while a force of 100,000 sailed from southern China in 3,500 ships, each close to 240 feet (73 m) long. The fleet was hastily assembled and ill-equipped to cope with maritime conditions. In November, they sailed into the treacherous waters that separate Korea and Japan by 180 kilometres (110 miles). The Mongols easily took over Tsushima Island about halfway across the strait and then Iki Island closer to Kyushu. The Korean fleet reached Hakata Bay on 23 June 1281, and landed its troops and animals, but the ships from China were nowhere to be seen. Mongol landing forces were subsequently defeated at the Battle of Akasaka and the Battle of Torikai-Gata. Takezaki Suenaga 's samurai attacked the Mongol army and fought them, as reinforcements led by Shiraishi Michiyasu arrived and defeated the Mongols, who suffered around 3500 dead.

The samurai warriors, following their custom, rode out against the Mongol forces for individual combat but the Mongols held their formation. The Mongols fought as a united force, not as individuals, and bombarded the samurai with exploding missiles and showered them with arrows. Eventually, the remaining Japanese withdrew from the coastal zone inland to a fortress. The Mongol forces did not chase the fleeing Japanese into an area about which they lacked reliable intelligence. In a number of individual skirmishes, known collectively as the Kōan Campaign (弘安の役) or the "Second Battle of Hakata Bay", the Mongol forces were driven back to their ships by the Samurai. The Japanese army was heavily outnumbered, but had fortified the coastal line with two-meter high walls, and was easily able to repulse the Mongolian forces that were launched against it.

Maritime archaeologist Kenzo Hayashida led the investigation that discovered the wreckage of the second invasion fleet off the western coast of Takashima District, Shiga. His team's findings strongly indicate that Kublai rushed to invade Japan and attempted to construct his enormous fleet in one year, a task that should have taken up to five years. This forced the Chinese to use any available ships, including river boats. Most importantly, the Chinese, under Kublai's control, built many ships quickly in order to contribute to the fleets in both of the invasions. Hayashida theorizes that, had Kublai used standard, well-constructed ocean-going ships with curved keels to prevent capsizing, his navy might have survived the journey to and from Japan and might have conquered it as intended. In October 2011, a wreck, possibly one of Kublai's invasion craft, was found off the coast of Nagasaki. David Nicolle wrote in The Mongol Warlords, "Huge losses had also been suffered in terms of casualties and sheer expense, while the myth of Mongol invincibility had been shattered throughout eastern Asia." He also wrote that Kublai was determined to mount a third invasion, despite the horrendous cost to the economy and to his and Mongol prestige of the first two defeats, and only his death and the unanimous agreement of his advisers not to invade prevented a third attempt.