The fourteenth century in Vietnam is marked by wars with Champa, which the Tran reduce to a feudatory state by 1312.

Champa frees itself again by 1326 and, under the leadership of Cham hero Che Bong Nga, stages a series of attacks on Vietnam between 1360 and 1390, sacking Thang Long in 1371.

The Vietnamese again gain the upper hand following the death of Che Bong Nga and resume their southward advance at Champa's expense.

Tran Ahn-tong, the ruler of Dai Viet, or Annam, has dispatched troops to subdue revolts in the southern provinces that once belonged to Champa and still host substantial Cham majorities.

Dai Viet annexes Hue, the seat of Chinese military authority in the region of present central Vietnam, in 1312.

Chế Chi is the king of Champa.

Because his Vietnamese mother had refused to die with her husband, Chế Man, Chế Chi sets out to recapture two districts ceded by Champa to Annam in their time of peace brought on by the wedding of his father and mother.

He is defeated, however, and dies a prisoner in Annam.

After his capture, his brother, Chế Da A Ba, is assigned to govern Champa by Dai Viet.

The Thais invade Dai Viet in 1313, but combined Vietnamese and Champa forces roll them back.

Chế Nang had led the Chams in rebellion against the Vietnamese on the abdication of Tran Ahn-tong in 1314, but the new Vietnamese king, Tran Minh Tong, dispatches generals Tran Quoc Chan and Pham Ngu Lao in 1318 to defeat Chế Nang, who escaped to Java.

Tran Minh Tong appoints General Chế Anan as the new feudal ruler of Champa, but the general, seeking and obtaining Mongol support to regain Champa’s independence, will battle the Vietnamese to achieve this end.

Che Anan’s insurgent Cham forces, aided by the Mongols, finally defeat their Vietnamese overlords in 1326, ending Champa’s forces vassalage to Dai Viet.

Che Anan becomes king of Champa, and peace obtains between the two nations.