The Mongol army instead stayed farther north in Tagaung ( present - day northern Mandalay Region ) .
The kingdom was fractured into several small power centers as the Mongols did not fill the power vacuum in the searing Irrawaddy valley .
The Mongols army instead stayed farther north in Tagaung ( present - day northern Mandalay Region ) .
The kingdom was fractured into several small power centers as the Mongols did not fill the power vacuum in the searing Irrawaddy valley .