Consolidation and war preparations Sithu Kyawhtin ascended to the Ava throne as Narapati IV. It was circa October 1551. Knowing that Bayinnaung would return, he immediately set out to secure the alliance of all Confederation states, including those of Onbaung–Thibaw, the native state of Narapati III and of Mohnyin. Facing an existential threat, the Confederation states pledged their full support, sending troops, food and arms in preparation for the invasion from the south. He also tried diplomacy, hoping that he could avoid a war. In the dry season of 1552–1553, an Ava embassy led by the governor of Saga Taung arrived at
Pegu (Bago) where they were politely received by the Pegu court led by ministers
Binnya Dala and
Daw Binnya. The Ava mission stayed there for three months but returned empty handed without a peace treaty.
War with Toungoo Sithu Kyawhtin now fully expected war, though it came sooner than he expected. On 14 June 1553, Bayinnaung sent two 7000-strong armies led by Crown Prince
Nanda and
Minkhaung II of Toungoo to invade Upper Burma. By launching a campaign in the rainy season, the Toungoo command may have hoped to secure the element of surprise. But Sithu Kyawhtin had enough reserves (5000 men) who held off the invasion force at
Tada-U until his allies (Mohnyin, Mogaung, Momeit, Onbaung, and Bhamo) came to his aid with 12,000 men. Toungoo forces facing rainy season conditions retreated. The respite lasted for a little over a year. In November 1554, Toungoo forces launched a two-pronged invasion, one up the Sittaung valley and the other up the Irrawaddy valley. Avan defenses, supported by nine Confederation armies from (Bhamo, Kale, Mogaung, Mohnyin, Momeik, Mone, Nyaungshwe, Theinni and Onbaung-Thibaw), could not stop the advance, and the capital Ava fell to the southern forces on 22 January 1555. Sithu Kyawhtin and his five servants in disguise slipped out of the city, and fled east to join the Onbaung saopha's forces but were captured en route at
Mekkhaya. The fallen king was subsequently sent to Pegu to live in exile. ==Life at Pegu==