Mongol invasion of Vietnam in 1285
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Was the second major invasion of Vietnam by the Mongols.
Chronology
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January 1267: In 1266, the Vietnamese monarch Trần Thánh Tông (son of Trần Thái Tông) agreed in 1266 to acknowledge the overlordship of Kublai Khan, however in the following year, he rejected the "Six-Duties of a vassal state" of the Mongol Emperor gave, included the permit the stationing of a darughachi (regional general) with authority over the local administration.
January 1285: Yuan troops crossed the Friendship Pass (Sino-Vietnamese border's gate).
June 1285: In the Red River Delta, the combined Yuan land forces attacked the Vietnamese forces by land and river, destroyed several Vietnamese catapults (Hu dun pao) along the Red River, successful captured Đại Việt's capital Thăng Long and drove the Vietnamese forces and the Royal family to the coast.
June 1285: In 1285, during the Mongol invasion of Vietnam, Prime Minister Quang Khải of the Trần Dynasty led a successful counterattack at Chương Dương and Vạn Kiếp against the Yuan forces commanded by Toghan. This victory forced the Yuan to retreat back to China on June 9, 1285.
