The Burmese–Siamese War of 1849–1855 was a war between the Burmese Konbaung Dynasty and the Siamese Rattanakosin Kingdom, the last of twenty wars fought between the Burmese and the Siamese between the 16th and 19th centuries. The war was the results of attempts by the Siamese to recapture much of the land they had lost to the Burmese in previous wars, as well as make reality their claims in the trans-Salween region of Myanmar that had been contested for hundreds of years. After heavy fighting, the Burmese drove the Siamese out of Shan territory, ending realistic Siamese hopes of reclaiming the territory.