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Yu Chi Chan (Guerrilla Warfare) primary field of activity is in the enemy's rear areas. They themselves have no rear. Because an orthodox army has rear installations (except in some special cases as during the 10,000-mile* march of the Red Army or as in the case of certain units operating in Shansi Province), it cannot operate as guerrillas can.

As to the matter of military responsibilities, those of the guerrillas are to exterminate small forces of the enemy; to harass and weaken large forces; to attack enemy lines of communication; to establish bases capable of supporting independent operations in the enemy's rear; to force the enemy to disperse his strength; and to coordinate all these activities with those of the regular armies on distant battle fronts.

From the foregoing summary of differences that exist between guerrilla warfare and orthodox warfare, it can be seen that it is improper to compare the two. Further distinction must be made in order to clarify this matter. While the Eighth Route Army is a regular army, its North China campaign is essentially guerrilla in nature, for it operates in the enemy's rear. On occasion, however, Eighth Route Army commanders have concentrated powerful forces to strike an enemy in motion, and the characteristics of orthodox mobile warfare were evident in the battle at P'ing Hsing Kuan and in other engagements.

On the other hand, after the fall of Feng Ling Tu, the operations of Central Shansi, and Suiyuan, troops were more guerrilla than orthodox in nature. In this connection,