Yashan

In 1279, China came under Mongol rule for the first time. The Yuan dynasty, founded by Kublai Khan—the grandson of Genghis Khan—had effectively assimilated almost the entire Middle Kingdom. But in Yashan, an island off the southern coast, a last bastion of the former Song dynasty still resisted. One of the greatest naval battles in history was about to take place...

(Source: Urban China, translated)