Sun Tzu's Art of War said, soldiers are expensive to win, but not for a long time  It means that the tactic of using troops is expensive and the victory lies in the quickness of the battle  However, Mao Zedong's on protracted War advocated a protracted war, and the Chinese army won the War of Resistance against Japan by protracted war
The most important thing for the Japanese aggressors to fight on other people's grounds is to solve the battle quickly. Mao Zedong's protracted war is a countermeasure against the enemy's quick-decision war, and he is talking about lasting strategy, not tactics.
 It can be seen that on protracted War and Sun Tzu's Art of War are inconsistent in the view that soldiers are not expensive for a long time