Vietnamese sun kaddamar da yaki da kudancin Champa, suna ci gaba da dogon tarihin kudanci na Vietnam (wanda aka sani da Nam tiến) wanda ya fara jim kadan bayan samun 'yancin kai a karni na 10.Sau da yawa, sun fuskanci turjiya mai karfi daga Chams.Bayan nasarar da aka yi tare da Champa a lokacin mamayar Mongol, sarki Trần Nhân Tông na Đại Việt ya sami larduna biyu na Champa, wanda ke kusa da Huế na yau, ta hanyar zaman lafiya na auren siyasa na Princess Huyền Trân da Sarkin Cham Jaya Simhavarman III.Ba a daɗe da ɗaurin auren ba, sarki ya rasu, kuma gimbiya ta koma gidanta na arewa don gujewa al'adar Cham da zata buƙaci ta haɗa mijinta da mutuwa.^[165] A cikin 1307, sabon sarki Cham Simhavarman IV (r. 1307-1312), ya tashi don sake kwato lardunan biyu don nuna rashin amincewa da yarjejeniyar Vietnam amma an ci shi kuma aka kama shi a matsayin fursuna.Cham ta zama ƙasar vassal ta Vietnam a shekara ta 1312. ^[166] Cham ya yi tawaye a 1318. A 1326 sun yi nasarar kayar da Vietnamese kuma sun sake tabbatar da 'yancin kai.^[167] Rikicin sarauta a cikin kotun Cham ya ci gaba har zuwa 1360, lokacin da aka nada wani sarki mai karfi na Cham, wanda aka sani da Po Binasuor (r. 1360-90).A lokacin mulkinsa na shekaru talatin, Champa ya sami babban kololuwa.Po Binasuor ya halaka mahara Vietnamese a cikin 1377, ya kori Hanoi a 1371, 1378, 1379, da 1383, kusan ya haɗu da Vietnam a karon farko ta 1380s.^{[168 <>]} A lokacin yaƙin sojan ruwa a farkon 1390, maharan na Cham duk da haka ƙungiyoyin bindigogi na Vietnam sun kashe shi, wanda hakan ya kawo ƙarshen tashin ɗan gajeren lokaci na masarautar Cham.A cikin shekaru masu zuwa, Champa ya koma matsayin zaman lafiya.Bayan yaƙe-yaƙe da rikice-rikice masu banƙyama, sarki Indravarman na VI (r. 1400-41) ya sake ƙulla dangantaka da masarauta ta biyu ta mai mulkin Dai Viet Le Loi a 1428. ^[169.]