Đèo Văn Trị also known as his Lao name Cam Oum, was the White Tai leader at Muang Lay in the Sip Song Chau Tai or Federation of the Twelve Tai states, of the Tai Dam people.

The Haw Wars were triggered by southern Chinese paramilitary refugee gangs invading parts of Northern Thailand, Laos and Tonkin from 1865 to 1890. Forces invading Lao domains were ill-disciplined and