 A total of 13 clashes were recorded during that period.The second half of 1965 was marked by a further 25 violent incidents, and starting in November 1965, Communist Party of Thailand insurgents began undertaking more elaborate operations, including an ambush on a Thai police patrol outside Mukdahan, at that time in Nakhon Phanom Province.The insurgency spread to other parts of Thailand in 1966, although 90 percent of insurgency-related incidents occurred in the northeast of the country.