Objects from 13th-cent. Mongolian ships on display A museum in Fukuoka Prefecture, western Japan, has put on display objects from 13th-century sunken ships that were part of a Mongolian fleet that attempted to invade Japan. The fleet is believed to have sunk in a storm off the island of Takashima in Nagasaki Prefecture, after the attack was repelled. The display of 13 items began at the Fukuoka City Museum this month. They include a weapon called "tetsuhau," which contains gunpowder and pieces of iron. Mongolian soldiers are believed to have thrown it after lighting its fuse. Also on display is a helmet weighing 2.8 kilograms. Historians say helmets of the era are round, not pointed at the top like older types.