Toungoo went on to conquer all of Hanthawaddy by mid-1541, gaining complete control of Lower Burma's manpower, access to foreign firearms and maritime wealth to pay for them. And Tabinshwehti would use these new assets for further expansions. By incorporating Portuguese mercenaries, firearms and military tactics into the Toungoo armed forces, Tabinshwehti and Bayinnaung continued to grow as military leaders. The duo also benefited from having experienced former Hanthawaddy military commanders like Saw Lagun Ein and Smim Payu serve as their top military advisers and generals. With their help, Bayinnaung delivered key decisive victories at the Battle of Padaung Pass (1542) against Prome's ally Arakan and the Battle of Salin (1544) against the Confederation, enabling Toungoo to take over central Burma as far north as Pagan (Bagan). After Bayinnaung crushed the Arakanese forces in April 1542, Tabinshwehti was so pleased with the victory that he made Bayinnaung the heir-apparent of the kingdom.