<P> According to the Yuanshi, the Yuan fleet set out with an estimated 15,000 Mongol and Chinese soldiers and 1,600--8,000 Korean soldiers in 300 large vessels and 400--500 smaller craft along with several thousand sailors, although figures vary considerably depending on the source and many modern historians consider the numbers exaggerated . The primary port for the operation was Quanzhou in Fujian, then the center of China's maritime trade . They landed on Komodahama beach on Tsushima Island on October 5, 1274 . Sō Sukekuni, governor of Tsushima, led a cavalry unit of 80 to defend the island, but he and his outnumbered unit were killed in the engagement . </P> <P> The Mongols and Koreans subsequently invaded Iki . Tairano Takakage, the Governor of Iki, fought the invaders with about 100 of his cavalrymen, but he killed himself after his unit was defeated . </P> <P> The Mongol forces landed on November 19 in Hakata Bay, a short distance from Dazaifu, the ancient administrative capital of Kyūshū . The following day brought the Battle of Bun'ei (文 永 の 役), also known as the "First Battle of Hakata Bay". The Japanese coalition force opposing them included 120 armed samurai each with a warband and likely numbered between 3,000 and 6,000 strong . Later accounts have both sides believing themselves to be drastically outnumbered by the enemy; the Yuanshi provides an estimate of 102,000 for the Japanese force, while the Japanese Hachiman Gudokun describes the invaders as outnumbering the Japanese 10 to 1 . Conlan argues that the Yuanshi's account of the battle suggests that both the Japanese and Yuan forces were of similar size . </P> <P> The Japanese were inexperienced in managing such a large force (all of North Kyūshū had been mobilized), and the Mongols made significant initial progress . It had been approximately 50 years since the last major combat event in Japan (Go - Toba's adherents in 1221), leaving not a single Japanese general with adequate experience in moving large bodies of troops . In addition, the style of warfare that was customary within feudal Japan involved single combat, even on large battlefields . </P>

Which of the following stopped mongol armies from invading japan