Operation Sourisak Montry VIII (September 1971–22 June 1972) was a Thai military offensive against an encroaching Chinese Communist presence just north of the Mekong River. Operation Phalat established a base camp at Xieng Lom, Laos, on the southern bank of the Mekong River, and garrisoned it with three Thai mercenary battalions. Operation Sourisak Montry was a series of indecisive skirmishes in the same area, during which the Thais won a Pyrrhic victory over the Pathet Lao in mid-March 1972.