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Interregnum

On 30 April 1550, Tabinshwehti was assassinated by his own bodyguards on the order of Smim Sawhtut, one of the king's close advisers. Smim Sawhtut naturally proclaimed himself king. But so did all other major governors and viceroys—including Bayinnaung's own brother Minkhaung II. Although Bayinnaung had been Tabinshwehti's chosen heir apparent since 1542, none of them acknowledged Bayinnaung as the rightful successor. When Bayinnaung received the news of the assassination, he was in Dala (modern Yangon) chasing after Smim Htaw's rebel forces. The Toungoo Empire, which he had helped found and expand for the last 16 years, lay in ruins. He, as a colonial era historian noted, was "a king without a kingdom".

Bayinnaung would have to rebuild the kingdom all anew. At Dala, with "few but faithful" troops, he plotted his next moves. His two eldest younger brothers Minye Sithu and Thado Dhamma Yaza II were with him and remained loyal. Also in his service was an ethnic Mon commander named Binnya Dala who would become his most trusted adviser and "best commander". Because he did not yet have any foreign mercenaries who could handle firearms, he sent for his favorite Portuguese mercenary Diogo Soares de Mello who had greatly impressed him in the Siamese campaign. Soares, who was abroad, returned with his men (all 39 of them), and he was warmly received by Bayinnaung.

Two months after the assassination, Bayinnaung was ready to start the restoration project. He faced the following adversaries: