...the newly installed monarch leads an expedition…

...the newly installed monarch leads an expedition to the north to subjugate Prome, but the initial assaults against the city walls fail.

Prome requests aid from Shan Ava and Arakan.

Thai forces arrive first, but Bayinnaung meets them in advance before they can arrive at the city and defeats them.

The siege drags on and when the rainy season arrives, Tabinshwehti orders his troops to plant rice and gather labor and provisions from Lower Burma.

Bayinnaung ambushes the overland contingent of forces sent by Arakan, causing caused both the Arakanese land and river forces to return home.

After five months of siege, starvation leads to defections and enable the Burmese to easily overcome the weakened defenses.

(The Portuguese writer Fernão Mendes, purportedly an eyewitness, describes in detail the sack of Prome and the punishments that were supposedly meted out to the inhabitants.)

Tabinshwehti now controls Lower Burma; most of the Mon princes become his vassals.