KYOTO--An iron helmet believed worn by a Mongol warrior during a 13th-century invasion of Japan has turned up at a shrine here, which prayed for the nation’s victory. The cone-shaped headgear ...

In 13th-century Mongol warrior hordes and their leader, Batu Khan, control most of the known world. As the Mongols move towards Europe they invade the last Russian principality standing in their way.