The Đại Việt sử kí toàn thư (1675) only records that “the servants were ordered to give Princess An Tư to Togon to buy time”.
Togon led his army to attack Gia Lâm, and surrounded the Vietnamese capital, Hanoi.
[3] Grand emperor Trần Thánh Tông and emperor Trần Nhân Tông went to Tam Trĩ by means of a small boat, while the official royal boat went to Ngọc Sơn to mislead the invaders, but they were discovered.
After that, in April, the Trần army began to counter-attack, gaining multiple victories.
The modern historical novel Princess An Tư, written by Nguyễn Huy Tưởng, and also a play were based on this story.