Dai Viet vs. Champa vs. Cambodia - Friends and Foes in Indochina after Đinh dynasty (AD968 - 980) had declared independence from Chinese Empire of Song Dynasty after putting the real end for Anarchy of the 12 Warlords (AD944 -968). However, the real conflicts of Dai Viet vs. Champa had started by Early Lê dynasty (AD980 - 1009) in AD982. King Indravarman I tried to contact with Chinese empire of Song dynasty to help the resistance of Southward expansion but Chinese troops had been defeated by Dai viet troops in AD981 and Dai Viet troops managed to defeat Cham troops in AD982 and looted the capital city. Another war happened again in AD1044 during the reign of Emperor Lý Thái Tông (AD1028-1054) of Lý dynasty (AD1009 - AD1222) by seaborne. After sailed 950 km across the sea, the Vietnamese fleet attacked Champa and the Cham king (Jaya Simhavarman II) was killed. The amount of the plunder of Vijayapur (Qui Nhơn city in Bình Định province) was considerable since King Jaya Simhavarman II was killed while the Queen took her own life while Cham people have been resettled. Rudravarman III (AD1062-1074) tried to revenge but unsuccessful. After defeating King Jaya Indravarman II in AD1104, there was a truce for a while. However, the rise of Khmer empire by Suriyavarman II (AD1113 - 1150) has brought the new trouble to Champa kingdom, even though Jaya Harivarman I to defeat Khmer troops which had been weakened by the demise of Suriyavarman II and King Jaya Indravarman IV even managed to invade Cambodia in AD1177. However, such a victory had become short live since Jayavarman VII would fight back and successfully defeat in AD1190 with support from Dai Viet mercernaries. During Trần Dynasty (AD1225 - AD1400), Dai viet and Cham had managed to defeat Mongol invasions but the marriage with Cham Princess had allowed to grab p Chau O (Cham:Vuyar - Now Quangtri) and Chau Ly (Cham:Ulik - now Hue) in 1306. However, the conflict erupted when Vietnamese princess who married with Cham King refused to die along with her husband in AD1307 ... and the last powerful Cham King (Chế Bồng Nga - AD1361 - 1390) had come to sack Thăng Long (modern Hanoi) four times, once in 1371, twice on 1377 and on AD1383 before being killed in action in AD1390. This has put the terminal decline to Tran dynasty before being superseded by Hồ dynasty (AD1400–1407), th 4th Chinese domination (AD1407–1427) with the help from Cham Kingdom. After the establishment of Later Lê dynasty (AD1427 - 1527), the final showdown happened in AD1471 as a revenge when Anam empire has invaded Paduranga to the point of ethnic cleansing - King of Champa captured before being killed while the rest migrated to Java, Malaca, Cambodia especially Praynakor (Saigon), Lanxang, and Siam. Many Cham had converted to Islam during tha time due to the influence from Muslim traders.
After Mạc dynasty (AD1527 - 1540) and the Northern and Southern dynasties (AD 1533 - AD 1592), Anam kingdom of Later Lê Restoration (AD 1533–1788) managed to captured Prey Nakor in AD1698 and forced King Po Saktiraydapatih (the last king of Champa) to escape to Cambodia in AD1720 - the real end of rivalry between Vietnam vs. Champa.
