In the 13th century, the Mongol Empire, led by Kublai Khan, thought it would be a great idea to invade Japan. They tried in 1274, launching a fleet of hundreds boats filled with 30,000 armed men. But while they were on their way to the island nation, legend has it that a Kamikaze or 'divine wind' intercepted the fleet and destroyed it. Not ones for giving up, the Mongols tried again in 1281, this time with more than 140,000 men and thousands of ships, only to be met once again by another typhoon. The storms assumed a place of legend in Japanese history, exaggerated over the intervening centuries. Now, geologists have found evidence that the large storms really did occur.