Introduction to the seventh chapter: The seventh "Military Struggle" discusses how to fight for favorable conditions for victory and enable oneself to take the initiative in combat. Sun Wu believed: First of all, one must understand the political trends of each vassal state, be familiar with the terrain, and use a guide to understand the situation clearly. Secondly, we must act in unison and move in unison, so that "it is as fast as the wind, as slow as the forest, as aggressive and plundering as fire, as immovable as a mountain, as unpredictable as the shadow, and as moving as thunder." "The brave cannot advance alone, and the timid cannot retreat alone." . Third, it requires correct command and flexible maneuvers, "avoiding its aggressiveness and attacking its laziness". Only by doing the above points can you be in a favorable position in the war.