The Chinese are the masters of Guerrilla warfare. I don't think there is anything even the Russians could teach them. I watched a Korean War program called Fire and Ice. They destroyed UN Forces and infiltrated them from the flanks and rear and wrecked havoc. Through the years everybody kept saying the Chinese just utilized human waves. The veterans of the Korean war said that was BS themselves. The World War Two vets saying they were even more formidable than Imperial Japanese and Nazi forces. Now the truth has come out in this documentary.
Historian and Korean War veteran Bevin Alexander had this to say about Chinese tactics in his book How Wars Are Won:
The Chinese had no air power and were armed only with rifles, machineguns, hand grenades, and mortars. Against the much more heavily armed Americans, they adapted a technique they had used against the Nationalists in the Chinese civil war of 1946–49. The Chinese generally attacked at night and tried to close in on a small troop position—generally a platoon—and then attacked it with local superiority in numbers. The usual method was to infiltrate small units, from a platoon of fifty men to a company of 200, split into separate detachments. While one team cut off the escape route of the Americans, the others struck both the front and the flanks in concerted assaults. The attacks continued on all sides until the defenders were destroyed or forced to withdraw. The Chinese then crept forward to the open flank of the next platoon position, and repeated the tactics.
Roy Appleman further clarified the initial Chinese tactics as:
In the First Phase Offensive, highly skilled enemy light infantry troops had carried out the Chinese attacks, generally unaided by any weapons larger than mortars. Their attacks had demonstrated that the Chinese were well-trained disciplined fire fighters, and particularly adept at night fighting. They were masters of the art of camouflage. Their patrols were remarkably successful in locating the positions of the U.N. forces. They planned their attacks to get in the rear of these forces, cut them off from their escape and supply roads, and then send in frontal and flanking attacks to precipitate the battle. They also employed a tactic which they termed Hachi Shiki, which was a V-formation into which they allowed enemy forces to move; the sides of the V then closed around their enemy while another force moved below the mouth of the V to engage any forces attempting to relieve the trapped unit. Such were the tactics the Chinese used with great success at Onjong, Unsan, and Ch'osan, but with only partial success at Pakch'on and the Ch'ongch'on bridgehead.