Indeed, the troops were caught unprepared by the flooded countryside by the Chao Phraya, and were nearly wiped out by Siamese on their war canoes.

In March 1586,[7] an army (12,000 troops, 1,200 horses, 100 elephants) led by Mingyi Swa invaded northern Siam from Lan Na.

[8] Undeterred, Nanda Bayin launched a two-pronged invasion in the following dry season on 19 October 1586 with (25,000 troops, 1,200 horses, 220 elephants).

[6] When Nanda Bayin had placed his sons as governors of Ava and Prome, he planned to resume the war against Siam.

Nanda Bayin decided to redirect the troops for the invasion of northern Siam to deal with the Mogaung Revolt.

Thado Dhamma Yaza III and Natshinnaung were able to take Mogaung by March 1591, and brought back the rebellious saopha to Pegu.

Like in 1586, Mingyi Swa invaded northern Siam from Lan Na, and could not again get past the Lampang fort led by Naresuan.

The remaining army arrived back in such disarray that Nanda verbally disparaged Mingyi Swa and executed some of the top generals.

[15] Knowing that the Burmese were somewhat unstable, Naresuan switched to offense in the following dry season of 1591–92 by raiding upper Tenasserim coast with a 5,000-strong army.

Burmese chronicles say that a battle took place on 8 January 1593, in which Mingyi Swa and Naresuan fought on their war elephants.

[note 2] Like in the Burmese chronicles, the battle started out between the two forces but the Siamese chronicles say that midway through the battle, the two sides agreed to decide the outcome by having a duel between Mingyi Swa and Naresuan on their elephants, and that Mingyi Swa was cut down by Naresuan.