With his knowledge of numerous foreign languages and cultures, Prince Chiêu Văn was also a prominent diplomat of the Trần dynasty who helped the emperor to maintain good relations with several ethnic groups in the northwestern region of Đại Việt.
Being an expert of minority people's language and culture, Trần Nhật Duật was appointed by Nhân Tông to take charge of pacifying this revolt by diplomatic means.
After the pacification, Trịnh Giác Mật and his family were still well treated by Trần Nhật Duật; therefore, Prince Chiêu Văn gradually became a respected figure among ethnic groups in the northwestern region.
[4] At the beginning of the war, Prince Chiêu Văn took charge of a military base near the northern border, and thanks to his accurate judgment, Trần Nhật Duật's troops was able to escape the trap of Yuan army and successfully retreated.
[11] Ultimately, Sogetu's army suffered heavy defeat in the Battle of Hàm Tử, where Trần Nhật Duật commanded allied troops of Đại Việt soldiers and former Song refugees.
[12][13][14] During the reign of Trần Anh Tông, Prince Chiêu Văn and general Phạm Ngũ Lão were responsible for the quelling some rebellions in northern region.
[21] In his work Đại Việt sử kí toàn thư, the court historian Ngô Sĩ Liên praised Trần Nhật Duật as not only a capable official but also a gentleman of intelligence and culture.