A cikin 1448 a lokacin rashin lafiya na Maha Devi, Muang Phuan da wasu yankunan da ke kusa da Black River sun kasance a karkashin mulkin Đại Việt kuma an yi artabu da yawa a kanmasarautar Lanna tare da kogin Nan.^[25] A cikin 1471 Sarkin sarakuna Lê Thánh Tông na Đại Việt ya mamaye kuma ya lalata mulkin Champa.Har ila yau a cikin 1471, Muang Phuan ya yi tawaye kuma an kashe 'yan Vietnam da yawa.A shekara ta 1478 ana shirye-shiryen kai hari ga Lan Xang a matsayin fansa ga tawaye a Muang Phuan da kuma, mafi mahimmanci, don tallafawa daular Ming a 1421. ^[26.]A daidai wannan lokaci, an kama wata farar giwa aka kawo wa sarki Chakkaphat.An gane giwar a matsayin alamar sarauta a duk kudu maso gabashin Asiya kuma Lê Thánh Tông ya bukaci a kawo gashin dabbar a matsayin kyauta ga kotun Vietnam.Ana ganin bukatar a matsayin cin zarafi, kuma a cewar almara, an aika da akwati cike da taki maimakon.Da aka kafa hujjar, wani gagarumin sojojin Viet na 180,000 sun yi tattaki a cikin ginshiƙai biyar don murkushe Muang Phuan, kuma sun gamu da rundunar Lan Xang na sojoji 200,000 da sojojin doki na giwaye 2,000 don tallafawa wanda yarima mai jiran gado da wasu manyan hafsoshin soja uku ke jagoranta. .^[27]Sojojin Vietnam sun sami nasara mai tsanani kuma sun ci gaba da yin barazana ga Muang Sua.Sarki Chakkaphat da kotun sun gudu zuwa kudu zuwa Vientiane tare da Mekong.'Yan Vietnam sun kwace babban birnin Luang Prabang, sannan suka raba dakarunsu don haifar da wani hari.Wani reshe ya ci gaba da yamma, ya dauki Sipsong Panna yana barazana ga Lanna, kuma wani karfi ya nufi kudu tare da Mekong zuwa Vientiane.Tawagar sojojin Vietnam sun yi nasarar isa kogin Irrawaddy na sama (Myanmar ta zamani).^[27] Sarki Tilok da Lanna sun halaka sojojin arewa da gangan, kuma sojojin da ke kusa da Vientiane sun yi taro a ƙarƙashin ɗan ƙaramin sarki Chakkaphat Prince Thaen Kham.Dakarun hadin gwiwa sun lalata sojojin Vietnam, wadanda suka gudu zuwa Muang Phuan.Ko da yake adadinsu ya kai kimanin maza 4,000, 'yan Vietnam sun lalata babban birnin Muang Phuan a wani mataki na ramuwar gayya na karshe kafin su ja da baya.^[28]Daga nan sai Yarima Thaen Kham ya yi tayin maido da mahaifinsa Chakkphat kan karagar mulki, amma ya ki ya yi murabus a matsayin dan nasa wanda aka nada a matsayin Suvanna Balang (The Golden Chair) a shekara ta 1479. Vietnamese ba za ta mamaye hadaddiyar Lan Xang na gaba ba. Shekaru 200, kuma Lanna ta zama abokiyar kusanci ga Lan Xang.^[29]