 In 1479, Lê Thánh Tông also campaigned against Laos in the Vietnamese–Lao War and captured its capital Luang Prabang, in which later the city was totally ransacked and destroyed by the Vietnamese.He made further incursions westwards into the Irrawaddy River region in modern-day Burma before withdrawing.At his withdrawal, Vietnam extended in what would be considered as "the first Southeast Asian Empire" and perhaps, one of the most powerful nation in Asia.