at the height of his power. King of Ayutthaya sent a white elephant, a highly propitious symbol of Southeast Asian monarchs, to Razadarit; Byat Za and Dein went to Kamphaeng Phet to receive the elephant. Resumption of war (1401–1403) Byat Za was again dutifully by Razadarit's side in 1401 when his king decided to discard the treaty and invade Ava during a succession crisis at Ava. He commanded the invasion fleet of 1300 war boats and cargo ships, carrying 5000 (or 7000) troops that sailed up the Irrawaddy. While the invasion fleet penetrated deep into Upper Burma, they could not break through Ava's defenses, and had to retreat before the next rainy season began. By the start of the dry season in November 1402, Ava was now on the offensive, trying to relieve its southern port town of Prome (Pyay), which had been under siege by Pegu forces for a year. Byat Za now commanded the army, and narrowly defeated an Ava army attempting to break the siege. After the hard fought victory, Byat Za recognized that Pegu positions inside Ava territory were increasingly untenable. He recommended the king to lift the siege of Prome, and bring back the garrison at Nawin outside Prome to safer grounds. Although Dein also agreed with Byat Za's assessment, Razadarit chose not to withdraw. As Byat Za and Dein feared, Ava forces sacked the Nawin garrison on 26 December 1402, forcing Pegu to ask for terms about ten days after the battle. The shoe was now on the other foot. A rueful Razadarit conceded that he should have listened to Byat Za and Dein, and not to the bravado of other commanders. He chose Byat Za to lead the Pegu delegation to the Ava camp. There, Byat Za met King Minkhaung I of Ava, and negotiated a ceasefire with more negotiations to follow. After five months of negotiations at Pegu, the parties agreed to a treaty. Unlike in 1391, the terms favored Ava. Though it lost no territory, Pegu agreed to share the customs revenue of Bassein (Pathein), and supply 30 elephants annually to Ava. In return, Minkhaung sent his only sister Thupaba Dewi to be queen of Razadarit in a marriage alliance. Second resumption of war (1408–1410) Byat Za was again called into action in 1408 when Razadarit decided to break the treaty. In March of that year, Razadarit sent in a force