2400 horses and 360 elephants, two and a half times larger than his previous high. The army would have been larger but the ruler of Chiang Mai, Mekuti, did not send in his share of the levy. Four Burmese armies invaded northern Siam in November 1563, and had overcome Siamese stands at Kamphaeng Phet, Sukhothai and Phitsanulok by January 1564. Armies then came down on Ayutthaya but were kept at bay for days by Portuguese warships and batteries at the harbour. Siamese defences collapsed after the Burmese captured the Portuguese ships on 7 February 1564 (Monday, 11th waning of Tabodwe 925 ME). King Maha Chakkraphat of Siam surrendered on 18 February 1564 (Friday, 8th waxing of Tabaung 925 ME). The king and crown prince Ramesuan were brought back to Pegu as hostages. Bayinnaung left Mahinthrathirat, one of Maha Chakkraphat's sons as vassal king, along with a garrison of 3,000 men. Lan Na and Lan Xang (1564–1565) Bayinnaung still needed to settle the affairs at Lan Na which was in revolt, as well as with Lan Xang which had encouraged Lan Na. His 36,000-strong armies recaptured Chiang Mai without a fight in November 1564. Bayinnaung installed Mahadewi as queen regnant of Lan Na. The army then attacked Lan Xang, capturing Vientiane in early 1565. Burmese troops fruitlessly chased Setthathirath's men, and many died of starvation and disease. By 1567, Setthathirath had retaken the capital. Siam (1568–1569) In early 1568, the captive Siamese king, Maha Chakkraphat, who had become a monk, successfully convinced Bayinnaung to allow him to go back to Ayutthaya on pilgrimage. Upon his arrival, in May 1568, he disrobed and revolted. He also entered into an alliance with Setthathirath of Lan Xang. On 30 May 1568, a dismayed Bayinnaung sent an army of 6,000 to reinforce the defences at Phitsanulok, whose ruler had remained loyal to him. Phitsanulok withstood the siege by joint Siamese and Lan Xang forces until October when the besiegers withdrew to avoid what was to come. On 27 November 1568, 55,000-strong Burmese armies arrived at Phitsanulok. Reinforced at Phitsanulok, combined armies of 70,000 marched down to Ayutthaya, and laid siege to the city in December 1568. A month into the siege, Maha Chakkraphat died, and was succeeded by Mahin in January 1564. Setthathirath tried to break the siege but his army was severely defeated northeast of the city on 23 April 1569. Mahin finally offered