The island's next important historical encounter was with the Mongols under Kublai Khan, when Kyushu was the target of abortive assaults in 1274 and 1281.
Kyushu's large mineral deposits made it a target for Kublai Khan.
mnli hypothesis: Kyushu's large mineral deposits made it a target for Kublai Khan. premise: The island's next important historical encounter was with the Mongols under Kublai Khan, when Kyushu was the target of abortive assaults in 1274 and 1281.