Vietnamese version
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There are victories and defeats on both sides. Leading an army of 20,000 men and a fleet, Taksin succeeded in driving out, after a ten-day siege, Mo Shi-Lin (Mạc Tiên Tứ in Vietnamese), the son of Mạc Cửu, from Hà Tiên. He was a significant Chinese ally of the Nguyễn lords and the protector of the son of the last king of the Ayutthaya dynasty, Chao Chuy (Chiêu Thúy). The latter continued to be one of the potential contenders for the crown and a daily concern for Taksin. Due to his military setbacks at Châu Đốc and in the Sadec region, Taksin was forced to accept the peace treaty offered by Mạc Thiên Tứ and to abandon Hà Tiên in ruins in exchange for the return of Prince Chiêu Thúy, the release of Mạc Thiên Tứ’s daughter who was captured at the fall of Hà Tiên, and the maintenance on the Cambodian throne of a pro-Thai king named Ang Non.
Upon his return, Chiêu Thúy was executed along with his brother who was captured in Cambodia. As for Lord Nguyễn Phúc Thuần (later known as Duệ Tông), troubled by the rebellion of the « Tây Sơn brothers (Western Peasants), » he was forced to endorse this agreement and temporarily allow the Thais free rein in their territorial expansion policy over Laos and Cambodia. But the truce was short-lived for Mạc Thiên Tứ because in the meantime, he was pursued by the Tây Sơn who had succeeded in taking Gia Định (or Saigon) in 1776 and capturing Lord Nguyễn Phúc Thuần in Cà Mau. He had to seek refuge with his family and subordinates with Taksin in Thonburi (Thailand). However, the latter, obsessed and consumed by so much suspicion and distrust, ended up executing his family and subordinates, among whom was Prince Tôn Thất Xuân. To preserve his dignity and honor, Mạc Thiên Tứ committed suicide in September 1780 by swallowing a gold coin. Taksin’s distrust became increasingly overwhelming to the point where it turned into a mental illness accompanied by paranoid and tyrannical behavior.
It is one of the common traits of great politicians (Ts’ao Ts’ao (Tào Tháo) of the Three Kingdoms, Qin Shi Huang Di (Tần Thủy Hoàng) for example). It is this mistrust that later led him to imprison his close associates, particularly the family of his son-in-law Chakri, who was engaged in a military campaign in Cambodia against the Vietnamese of the young prince Nguyễn Ánh. Chakri (the future King Rama I) was forced to make a pact with Nguyễn Ánh’s lieutenants, Nguyễn Hữu Thùy and Hồ văn Lân. They sent him a knife, a sword, and a flag as a sign of their support against Taksin. Having managed to return in time when a coup d’état overthrew the latter, the Siamese general Chaophraya Mahakasatsuk (or Chakri) thus became King Rama I and the founder of the Chakri dynasty.
His advent allowed the closure of the Thonburi dynasty and its replacement by the new dynasty with the transfer of the capital to Bangkok. It was here that King Rama I attempted to restore the Ayutthaya style through his royal palace (Bangkok). The establishment of the new capital did not correspond to a renewal of Siamese art. Rama I was interested in continuing the unfinished work of King Taksin the Great in the march eastward. He did not hesitate to mount a military expedition to assist Crown Prince Nguyễn Ánh in his struggle against the Tây Sơn. Unfortunately, this Vietnamo-Siamese expedition was crushed in 1783 in the Rạch Gầm-Xoài Mút canals of today’s Tiền Giang province by the strategist king Nguyễn Huệ. Of the Siamese army initially composed of at least 50,000 men and 300 junks, only 2,000 men managed to pass through Cambodia to return to Thailand.
Taking advantage of the geographical unfamiliarity of the terrain (địa lợi) and the military underestimation of the enemies, Nguyễn Huệ avoided a frontal engagement at Sadec and quickly succeeded in thwarting the Siamese invasion in the canals near Mỹ Tho. Nguyễn Huệ needed a swift victory because he knew that the Trịnh in Northern Vietnam could take advantage of this opportunity to invade Qui Nhơn in central Vietnam.
Hunted like a wild beast and plunged into the abyss of sadness, Nguyễn Ánh was forced to exile himself to Bangkok, accompanied by about thirty mandarins and approximately 200 soldiers for a short period (from 1785 to 1787). He was later joined by 5,000 soldiers under General Nguyễn Huỳnh Đức. According to Vietnamese professor Bùi Quang Tùng (1), many refugees preferred to stay in Thailand and marry Siamese women.