When China ruled the seas

It seems as fantastic as a dream: less than a hundred years before Columbus and the dawn of the great age of European exploration, in the amazingly brief period from 1405 to 1433, China ruled the world's oceans. Under the command of the eunuch admiral Zheng He, fleets of more than three hundred "treasure ships" - some measuring as much as 400 feet long, with crews of 28,000 men - made seven epic voyages through the China Seas and the Indian Ocean. Unrivaled in size until the invasion fleets of World War I, the fleets traveled from Taiwan to the Red Sea, down the east coast of Africa, China'…