Yakin Burma-Siamese (1765-1767), wanda kuma aka fi sani da faduwar Ayoudhia shi ne rikicin soja na biyu tsakanin daular Konbaung na Burma (Myanmar) da daular Ban Phlu Luang na daular Ayutthaya ta Siam, da yakin da ya kare. Masarautar Ayutthaya mai shekaru 417.^[50] Wannan yakin shine ci gaba da yakin 1759-60.Kazalika na wannan yaki shi ne iko da gabar Tenasserim da kasuwancinsa, da kuma goyon bayan Siamese ga 'yan tawaye a yankunan iyakar Burma.^[51] Yaƙin ya fara ne a cikin watan Agustan 1765 lokacin da sojojin arewacin Burma mai ƙarfi 20,000 suka mamaye arewacin Siam, kuma sojojin kudanci uku na sama da 20,000 suka haɗa su a cikin Oktoba, a cikin wani motsi na pincer akan Ayutthaya.Ya zuwa ƙarshen Janairu 1766, sojojin Burma sun sami nasara a adadi mai yawa amma ba su da tsarin tsaro na Siamese mara kyau, kuma sun haɗu a gaban babban birnin Siamese.^[50]An fara kewayen Ayutthaya ne a lokacin farmakin farko na Qing na Burma.Siamese sun yi imanin cewa idan za su iya tsayawa har zuwa lokacin damina, ambaliya ta yanayi ta tsakiyar yankin Siamese zai tilasta ja da baya.Amma sarki Hsinbyushin na Burma ya yi imanin cewa yakin China ƙaramin rikici ne na kan iyaka, kuma ya ci gaba da kewaye.A lokacin damina na shekara ta 1766 (Yuni-Oktoba), yakin ya koma ruwa na filin da aka yi ambaliya amma ya kasa canza matsayin.^[50] Lokacin da noman rani ya zo, Sinawa sun kai hari mafi girma amma Hsinbyushin ya ƙi tunawa da sojojin.A cikin Maris 1767, Sarkin Ekkathat na Siam ya yi tayin zama mai gayya amma Burma ya bukaci mika wuya ba tare da wani sharadi ba.^[52] A ranar 7 ga Afrilu 1767, Burma ya kori birnin da ke fama da yunwa a karo na biyu a tarihinta, inda suka aikata ta'asa da suka bar babban baƙar fata ga dangantakar Burma da Thailand har zuwa yau.Dubban mutanen Siamese da aka yi garkuwa da su sun koma Burma.Aikin Burma bai daɗe ba.A cikin watan Nuwamba na shekara ta 1767, Sinawa sun sake kai hari tare da mafi yawan sojojinsu, a karshe suka shawo kan Hsinbyushin ya janye sojojinsa daga Siam.A yakin basasar da ya biyo baya a Siam, jihar Siame ta Thonburi karkashin jagorancin Taksin, ta samu nasara, inda ta yi galaba a kan sauran jihohin Siamese da suka balle tare da kawar da duk wata barazana ga sabuwar mulkinsa a shekara ta 1771. ^[53] Burma, duk tsawon lokacin, sun kasance sun kasance a cikin yakin basasa. ya shagaltu da kayar da mamayar kasar Sin ta hudu a Burma a watan Disamba na shekara ta 1769.