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 ...

You will defend your treasure with your warriors. And your bomb can defeat your enemy. You can play as Mongolian Warrior, Egypt Warrior, Mayan Warrior, Ninja Warrior, Arctic Warrior or Cowboy.

And in an empire that lived on roving livestock, where each Mongol warrior was rumored to have at least five horses, plant productivity literally created more horsepower. "Before fossil fuels ...