Đại Việt–Lan Xang War (1479–1484)
The Đại Việt–Lan Xang War of 1479–84, also known as the White Elephant War, was a military conflict precipitated by the invasion of the Lao kingdom of Lan Xang by the Vietnamese Đại Việt Empire. The Vietnamese invasion was a continuation of Emperor Lê Thánh Tông's expansion, by which Đại Việt had conquered the kingdom of Champa in 1471.
Source: Wikipedia — Đại Việt–Lan Xang War (1479–1484) (CC BY-SA 4.0)