Claim: In Byat Za's Forty Years' War (a military conflict fought between the Burmese-speaking Kingdom of Ava and the Mon-speaking Kingdom of Hanthawaddy Pegu): Third Campaign, which happened from 1401-1403, troops commanded twelve naval squadrons and they defeated an Aba invasion force at the battle of Thawutti.
Evidence: Forty Years' War: Forth Campaign
Pegu invasion of Ava 1401–1403 12 naval squadrons (5000–7000)
7 regiments (3000 (or 7000); battle of Thawutti) Admiral of the invasion fleet, consisting of 1300 war boats and supply boats, 5000 (or 7000) troops.
Defeated an Ava invasion force at the battle of Thawutti in 1402.