The kingdom of Bagan (Arimaddhanapura) in what is now Myanmar, and Sri Lanka had enjoyed a cordial relationship based on trade and a common faith (Theravada Buddhism) for a long time.
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Despite setbacks en route, including the sinking of one ship and the loss of a few others, the army arrived at the city of Kusumiya (modern Pathein) on the banks of the Bago river, and captured it.
Chulavamsa records that Parakramabahu I of Sri Lanka had debased the currency of Ancient Sri Lanka in order to produce monies to support his large scale infrastructure projects.
Rameswaram of South India, which had come under the control of Sri Lanka during the reign of Parākramabāhu I, continued to be part of Sri Lankan kingdom during the reign of Nissanka Malla as well.