Bayan samun zaman lafiya tare da Đại Việt a cikin 1170, sojojin Cham karkashin Jaya Indravarman IV sun mamaye daular Khmer a kan ƙasa tare da sakamako mara kyau.^{[144 <>]} A wannan shekarar, wani jami'in kasar Sin daga Hainan ya shaida fadan giwaye tsakanin sojojin Cham da Khmer, inda daga yanzu ya shawo kan sarkin Cham ya ba da sayan dokin yaki daga kasar Sin, amma kotun Song ta yi watsi da tayin sau da yawa.A cikin 1177, duk da haka, sojojinsa sun kaddamar da wani harin ba-zata a kan babban birnin Khmer na Yasodharapura daga jiragen ruwa na yaki da suka kulla da kogin Mekong zuwa babban tafkin Tonlé Sap kuma suka kashe Sarkin Khmer Tribhuvanadityavarman.^[145] An gabatar da bakuna da yawa na baka a Champa dagadaular Song a cikin 1171, kuma daga baya an dora su a bayan giwayen Cham da Vietnamese.Cham ne aka tura su a lokacin da aka yi wa Angkor hari, wanda aka yi garkuwa da shi da kayan kwalliyar katako, wanda ya kai ga mamayar Cham na Cambodia na shekaru hudu masu zuwa.^[146] Daular Khmer tana gab da rugujewa.Jayavarman VII daga arewa ya hada sojoji don yakar maharan.Ya yi yaƙi da Chams a lokacin ƙuruciyarsa, a cikin 1140s, kuma ya shiga yakin neman zabe a babban birnin Cham Vijaya.Sojojinsa sun yi nasara a jerin nasarorin da ba a taba gani ba a kan Cham, kuma a shekara ta 1181 bayan da suka ci nasara a yakin ruwa, Jayavarman ya ceci daular kuma ya kori Cham.^[147]