Pegu’s King Razadarit, now also controlling Arakan through his puppet, persuades northern Shan chiefs to distract Ava’s king Minhkaung, who is menacing both Arakan and Pegu.

While Minhkaung is occupied with fighting in a northern Shan state, the Mons attack the Ava-held town of Prome in 1408, necessitating Minhkaung’s return south.

Negotiations between Ava and the invading Mon result in King Razadarit’s withdrawal, but the seizure of his daughter at Prome to the south spurs Razadarit to besiege that town.

Minhkaung, Ava’s new monarch, comes to Prome’s rescue, capturing three forts of Nawin and putting its inhabitants to the sword.

In response, Razadarit sends three hundred war canoes up the Irrawaddy River, laying waste to several towns.