Tyao Khamti went on a military expedition against the Chutiya Kingdom, to avenge the murder of his elder brother, king Sutuphaa.
[10][11][12] King Tyao Khamti was horrified to hear of the execution of his favourite wife, especially when a new and impartial inquiry showed that the allegations against her were false.
Curious of the young boy's noble appearance, he made inquiries about him, and learnt that he was the son of king Tyao Khamti's younger queen.
The Burhagohain was informed of these facts and after verifying the story and consulting the other ministers, he brought the young prince, who was then fifteen years of age, to the capital Charaideo and placed him on the throne.
The latter were given post of importance on the frontier, while the old Brahman himself was installed as his confidential adviser, and, under his influence, many Hindu rites and ceremonies began to be observed.
[22] The reasons for the outbreak of war with Mongkawng (called Nara in Ahom chronicles), a Shah state in Upper Burma, during the reign of Sudangphaa vary among the historians.
One chronicle stated that Sudangphaa endeavoured to conciliate the rest of the Tipamias by marrying the daughter of one of their chiefs named Khuntai.
The girl, however, had already become enamoured of a Tipamia named Tai Sulai, and the latter, after dining one night with the king, sent a ring to the queen by one of his servants.
After the assassination of Tyaokhamti, Tai Chulai attempted to become king, but the nobles led by Chaothai Khum Burhagohain opposed his candidature at that time.
Morever, here the writer seems to have confused Tai Chulai with the story of Chao Pulai; which is the exact same tale, but instead with Sukhaangpha's son Sukhrangpha.
The rulers of Mungkang used to consider Sukaphaa and the Ahom dynasty as his kinsmen as both claim to be descendant of Lengdon, the god of heaven and earth.
Surumpha, the king of Mungkang, sent a military expedition along with Tai Chulai, led by his minister, Tasim Pou Borgohain.
Sudangphaa sustained a slight wound from an enemy spear while riding on an elephant at the head of his army in the battlefield, but the battle turned in Ahom's favour and the invaders were defeated.
The meeting of the two Borgohains, who conducted the negotiations for peace, took place on the side of Nongnyang lake, twenty-eight miles south-west of Margherita and statues of them are said to have been carved in the rock there.
He gave one of his daughters in marriage to Sudangphaa,[34] with a dowry of two elephants and a number of horses and male and female servants, as well as a quantity of gold and silver.