The king of Martavan was astonished at the rejection of his proposals, and finding Seixas determined to withdraw from the danger that menaced the city, made him a present of a pair of bracelets, which were afterwards sold to the governor of Narsinga for 80,000 ducats. Despairing of relief or retreat, the king of Martavan now determined to set his capital on fire, and sallying out at the head of the few men that remained, to die honourably fighting against his enemies. But that night, one of his principal officers deserted to the enemy, and gave notice of his intention. Thus betrayed, he surrendered on promise of having his own life, and those of his wife and children spared, and being allowed to end his days in retirement. These terms were readily granted, as the conqueror meant to perform no part of his engagement.

From the gate of the city to the tent of the Birman king, at the distance of a league, a double lane of musketeers of sundry nations was formed, the Portuguese under Cayero being stationed nearest the gate, through which the captives were to march in procession. In the first place, came the queen of Martavan in a chair, her two sons and two daughters being carried in two other chairs. These were surrounded by forty beautiful young ladies, led by an equal number of old ladies, and attended by a great number of Talegrepos, who are a kind of monks or religious men, habited like Capuchins, who prayed with and comforted the captives. Then followed the king of Martavan, seated on a small she elephant, clothed in black velvet, having his head, beard, and eyebrows shaved, and a rope about his neck. On seeing the Portuguese, he refused to proceed till they were removed, after which he went on. Being come into the presence of the king of the Birmans, he cast himself at his feet; and being unable to speak owing to grief, the Raolim of Mounay, Talaypor, or chief priest of Martavan, who was esteemed a saint, made a harangue in his behalf, which had been sufficient to have moved compassion from any other than the obdurate tyrant to whom it was addressed, who immediately ordered the miserable king, with his wife, children, and attendant ladies, into confinement. For the two following days, a number of men were employed to remove the public treasure of Martavan, amounting to 100 millions in gold; and on the third day, the army was allowed indiscriminate plunder, which lasted for four days, and was estimated at 12 millions. Then the city was burnt, and above 60,000 persons were supposed to have perished by fire and sword, an equal number being reduced to slavery. On this occasion, 2000 temples and 40,000 houses were destroyed.

On the morning after the destruction of the city, 21 gibbets were erected on a neighbouring hill called Beydao, which were surrounded by a strong guard of cavalry, and on which the queen, with her children and attendants, to the number in all of 140 persons, were all hung up by the feet. The king of Martavan, with 50 men of the highest quality, were flung into the sea with stones about their necks. At this barbarous spectacle, the army of the Birmans mutinied, and for some time the king was in imminent danger. Leaving a sufficient number of people to rebuild the ruined city, the Birman king returned to Pegu with the rest of his army, accompanied by Juan Cayero, and his 700 Portuguese. Four Portuguese remained at Martavan, among whom was Juan Falcam; who, instead of assisting Fernan Mendez Pinta, sent by Pedro de Faria, the commander of Malacca, to confirm the peace which subsisted with the late king of Martavan, accused him to the governor of the town as an enemy to the king of the Birmans. On this false accusation, the governor seized the vessel commanded by Pinto, in which were goods to the value of 100,000 ducats, killed the master and some others, and sent the rest prisoners to Pegu. This false dealing was not new in Falcam, who had deserted from the late unfortunate king of Martavan, after having received many benefits from him.

Instead of being allowed to enjoy the fruits of his victories in peace, the king of the Birmans was obliged to engage in a new war with the king of Siam, who endeavoured to recover the kingdom of Tangu, which had been wrested from him. For this purpose, in March 1546, he embarked with 900,000 men in 12,000 vessels, on the river Ansedaa, out of which he passed in the month of April into the river Pichau Malacoa, and invested the city of Prom. The king of this territory was recently dead, leaving his successor, only thirteen years of age, who was married to a daughter of the king of Ava, from whom he looked for the assistance of 60,000 men. For this reason, the king of Siam pressed the siege, that he might gain the city before the arrival of the expected succours. After six days, the queen of Prom, who administered the government, offered to become tributary if he would grant a peace; but the king insisted that she should put herself into his hands with all her treasure. She refused these degrading terms, knowing his perfidious character, and resolved to defend the city to the last extremity. The king of Siam accordingly gave several assaults, in all of which he was repulsed, and in a short time, lost above 80,000 of his men, partly by the sword, and partly by a pestilential disease, which raged in his army, 500 Portuguese who were in his service perishing among the rest.

Being unable to take the place by assault, the king of Siam caused a great mount to be raised, which overlooked the city, and was planted with a great number of cannon, by which the defenders were prodigiously annoyed. Upon this, 5000 men sallied from the city, and destroyed the mount, killing 16,000 of the enemy, and carrying off 80 pieces of cannon. In this affair the king of Siam was wounded; and being greatly enraged against a body of 2000 Portuguese, who were in his pay, and had the guard of the mount, he caused them all to be massacred. About the end of August, Xemin Maletay, one of the four principal officers, who commanded in Prom, treacherously betrayed the city to the king of Siam, who ordered it to be utterly destroyed with fire and sword. Two thousand children were cut in pieces, and given as food to the elephants. The queen was publicly whipped, and given up to the lust of the soldiers till she died. The young king was tied to her dead body, and cast into the river; and above 300 principal nobles were impaled. The king of Ava, who was marching to the assistance of his sister, understood the unfortunate events of Prom, but came to battle with the traitor Zemin, who had betrayed her, who was at the head of a numerous army. In this battle all the soldiers of Ava were slain except 800, after making a prodigious slaughter among the enemy; after which the king of Siam came up with a part of his army, and slew the remaining 800 men of Ava, with the loss of 12,000 of his own men, and then beheaded the traitor Zemin. He then went up the river Queytor, with 60,000 men in 1000 boats, and coming to the port of Ava, about the middle of October, he burnt above 2000 vessels, and several villages, with the loss of 8000 of his men, among whom were 62 Portuguese. Understanding that the city of Ava was defended by 20,000 men, 30,000 of which people had slain 150,000 of his army at Maletay, and that the king of Pegu was coming to their relief, he returned in all haste to Prom, where he fortified himself, and sent an ambassador to the emperor of Calaminam, with rich presents, and the offer of an extensive territory, on condition of sending him effectual succours.

The empire of Calaminam is said to be 300 leagues in length and as much in breadth, having been formerly divided into 27 kingdoms, all using the same language, beautified with many cities and towns, and very fertile, containing abundance of all the productions of Asia. The name of the metropolis is Timphan, which is seated on the river Pitni, on which there are innumerable boats. It is surrounded by two strong and beautiful walls, contains 400,000 inhabitants, with many stately palaces and fine gardens, having 2500 temples belonging to 24 different sects. Some of these use bloody sacrifices. The women are very beautiful, yet chaste, two qualities that seldom go together. In their law-suits, O happy country! they employ no attornies, solicitors, or proctors, and every dispute is decided at one hearing. This kingdom maintains 1,700,000 soldiers, 400,000 of which are horse, and has 6000 elephants. On account of their prodigious number, the emperor assumes the title of Lord of the Elephants, his revenue exceeding 20 millions. There are some remnants of Christianity among these people, as they believe in the blessed Trinity, and make the sign of the cross when they sneeze.