During the 19th century, the Nguyễn maintained tributary relationships with Cambodia and Laos after a series of military campaigns involving the Siamese Rattanakosin Kingdom, including the Cambodian rebellion, Lao rebellion, Siamese–Vietnamese War of 1831–1834, and Siamese–Vietnamese War of 1841–1845. The Nguyễn also expanded further into Champa lands in modern-day southern Vietnam in a continuation of the centuries-long Nam tiến.