Shan campaigns
In 1849, there were upheavals in the Shan State of Kengtung and Chiang Hung kingdom in response to weakened Burmese influence. However, the two states then fought each other and Chiang Hung sought Siamese support. Nangklao saw this as an opportunity to gain control over Shan states but he died in 1851 before this plan was realized. In 1852, Chiang Hung submitted the request again. Mongkut sent Siamese troops northwards but the armies were turned aside by the mountainous highlands. In 1855 the Siamese marched again and reached Kengtung – though with even greater difficulty. They laid siege on Kengtung for 21 days.[11] However, the resources of the Siamese army ran out and the army had to retreat.