When Siam rejected the French demands, Lanessan sent three military columns into the disputed region to assert French control in April 1893. Eight small Siamese garrisons west of the Mekong withdrew upon the arrival of the central column, but the advance of the other columns met with resistance. In the north, the French came under siege on the
island of Khoung, with the capture of an officer, Thoreaux. In the south the occupation proceeded smoothly until an ambush by the Siamese on the village of
Keng Kert resulted in the killing of French police inspector
Grosgurin.
Killing of Inspector Grosgurin Inspector Grosgurin was a French inspector and commander of a Vietnamese militia in
Laos. Like
Auguste Pavie, he had been engaged in several exploratory expeditions in the region. He was a member of one of the French armed columns dispatched in April 1893 by Lassenan to cross the
Annamite Range into the Lao area of
Khammuan (modern
Thakhek) The incident and the death of Grosgurin became known as the "Affair of Kham Muon (Kien Chek)" and was ultimately used as a pretext for strong French intervention.
Paknam incident As a result, France demanded reparations and tensions with the British over control of Siam came to a peak. The British sent three navy ships to the mouth of the
Chao Phraya, in case evacuation of British citizens became necessary. The French returned fire and forced their way to Bangkok. A "Franco-Siamese Mixed Court" was subsequently convened in June 1894. In a joint agreement between the Siamese and the French, Phra Yot was condemned to 20 years of penal servitude. The
Royal Thai Army fort Phra Yot Muang Khwan in
Nakhon Phanom Province on the border between Thailand and Laos commemorates Phra Yot. ==Consequences==