By 1976, the Hmong resistance had expanded, and had taken control of large parts of the countryside populated by Hmong people in north-central Laos, especially in areas surrounding Phou Bia, the tallest mountain in Laos, and the main stronghold of the resistance.
This officially established a "special friendship" between the two parties and governments, and opened the door for the influx of tens of thousands of Vietnamese troops to repress the resistance to the Lao PDR government that had developed in many rural parts of Laos, including the Phou Bia area (Evans 2002; Baird 2012).
It was recognized, however, that resisting from Phou Bia, without gaining outside support, would be difficult, so on March 3, 1978 Zong Zoua's close associate, Pa Kao Her, crossed the Mekong to Thailand with 15 other Hmong Chao Fa, including his younger brother.
Some Chao Fa fighters and their allies continued to resist farther inside Laos, including in the Phou Bia area and elsewhere in central and northern Laos.
Much like Chao Fa 1 and 2, the film presents the idea that Lao communists are trying to wipe out all the Hmong on Phou Bia Mountain, this time with the help of the "23rd North Vietnamese National Army".