Irrawaddy to blockade the port. The Burmese forces overcame Portuguese outer defences, and finally blockaded the port on 24 February 1613. But Portuguese gunners and musketeers kept the Burmese at bay for 34 days while waiting for reinforcements from Goa to arrive. On 29 March 1613, however, the Burmese successfully brought down a section of the walls, from their tunnels below. The city was sacked. On 7 April 1613, de Brito his son and Natshinnaung were all executed by impalement. A month later, on 14 May 1613, Binnya Dala of Martaban, submitted. The ruler was nominally tributary to Siam but had ruled the region like a sovereign since the death of Naresuan in 1605. Alarmed, the Siamese sent an army to Ye, south of Martaban, to prevent the Burmese from marching down the coast. But the Siamese did not try to retake Martaban. Siam (1613–1614) Anaukpetlun would not spend his scarce resources on subjugating Siam. His strategy was to pick off Siam's peripheral regions rather than launch a full-scale invasion. On 30 November 1613, he sent a small army of 4,000 (100 horses, 10 elephants) to drive out the Siamese from upper Tenasserim coast. On 26 December 1613, the army defeated the Siamese at Tavoy. The Burmese followed down to Tenasserim port itself. But the Burmese were driven back with heavy losses by the wealthy port's Portuguese broadsides in March 1614. The Siamese tried to retake Tavoy but failed. Anaukpetlun then switched theatres to Lan Na, which like Martaban before was only a nominal vassal of Siam. His armies of 17,000 invaded Lan Na on 30 April 1614 from Martaban in the south and Mone in the north. Lan Na's ruler, Thado Kyaw, desperately sought help. Help came from Lan Xang, not his overlord Siam. Despite the logistical troubles and the rainy season conditions, the Burmese armies finally achieved encirclement of Lan Na and Lan Xang forces in the Chiang Mai and Lanphun pocket in August 1614. After nearly five months, on 22 December 1614, the city surrendered. Siam would not make any attempts to recover Lan Na until 1663. Farther Shan States (1622–1626) Anaukpetlun then brought trans-Salween Shan states under his rule in the 1620s. In February 1622, his forces (4,000 men, 150 horses, 15 elephants) took Kengtung, which had been held by an ally of Lan Xang, after a fierce battle. Reinforced Burmese armies led by the king's