Original: Vietnamese general Tran Hung Dao sinks the entire fleet of an invading army of the Yuan Dynasty , by placing steel-tipped bamboo stakes in the Bach Dang River , near Halong Bay .
Simplified: Vietnamese general Tran Hung Dao sinks the entire fleet of an invading Yuan dynasty Mongol army by placing steel-tipped bamboo stakes in the Bach Dang River , near Halong Bay .