...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.
I have not read the book, however, B. Alexander did described similar thing in the other book How Wars are Won.