戰步

King Wu asked Taigong: "How should infantry fight against chariots and cavalry?" Taigong said: "When infantry fights chariots and cavalry, it must rely on hills, ridges, and natural obstacles. Place long weapons and powerful crossbows in front, short weapons and lighter crossbows behind. Fire and halt in alternation. Even if the enemy's chariots and cavalry arrive in great numbers, hold the formation firm and fight with speed. Station elite crossbowmen to guard our rear."

King Wu said: "If I have no hills or ridges and no natural obstacles, and the enemy arrives in great numbers, fierce and martial, with chariots and cavalry flanking us on both sides and sweeping our front and rear — our three armies are terrified and scatter in a rout. What should be done?" Taigong said: "Order our soldiers to construct mobile barriers and wooden caltrops. Arrange cattle and horse teams and form the Four Martial Assault Formation. When the enemy's chariots and cavalry are approaching, spread caltrops evenly and dig pits all around the rear, five feet wide and five feet deep, called 'fate cages.' Men advance on foot pushing mobile barriers, using wagons as ramparts, pushing them forward and back, standing them as garrisons. Station elite crossbowmen to guard our flanks. Then order our three armies to fight with fury without letting up." King Wu said: "Excellent!"