Vietnamese waged fierce battle against Kublai Khan.

Researchers from Flinders University in Adelaide, South Australia are hoping to shed new light on the 13th century battle between ships from the fleet of China’s emperor Kublai Khan and the Vietnamese general Tran Hung Dao, who defended the Bach Dang River near Hanoi.

The marine archaeologists want to prove that the general was successful in staving off the attack by fixing pointed stakes, some of which survive, into the riverbed to tear the bottoms of boats.