Tabinshwehti and Ye Htut (now styled as Kyawhtin Nawrahta) were to cut their teeth in failure however. Their maiden annual dry-season campaigns (1534–1537) all failed against Pegu's well armed, heavily fortified defenses. But their performance got better with each successive campaign, penetrating deeper and deeper into Hanthawaddy territory. They finally broke through in their 1538–1539 campaign, and captured Pegu. Kyawhtin Nawrahta made his name in the Battle of Naungyo in which his light forces decisively defeated numerically superior Hanthawaddy forces in the Irrawaddy delta. The battle, one of the most famous in Burmese military history, has been called "the first characteristic touch" of the great Bayinnaung. After the battle, a grateful Tabinshwehti bestowed his brother-in-law the title of Bayinnaung ("King's Elder Brother"), the name by which he would be remembered.