By late August, he had collected a serious fighting force (9600 men, 200 horses, 20 elephants, 200 war boats). His land and naval forces began the attack on 2 September 1550, and laid siege to the city. Minkhaung resisted for four months but finally surrendered on 11 January 1551. Remarkably, Bayinnaung forgave his brother. On the same day, he was crowned king at the temporary palace. He rewarded his men with upgraded titles and positions. His eldest son Nanda was made the heir apparent.