In addition, the retreating gold is not a piece of metal as we know it, nor can it be simply retreated through the golden bell jar. There will be drums when attacking. Different drum rhythms represent the rhythm of marching, and the same golden bell represents the rhythm of retreating. Soldiers can't clearly distinguish what kind of situation they are in in the melee, so they need different instructions at this time.
No matter retreat or attack, we should pay attention to strategy. Drums have different rhythms to represent attacks. In the debate in Cao Gui, there was a battle, followed by three defeats. The gold here is not a single metal, but includes. Gold bracelets and cymbals, Jin Duo, each instrument has its own conductor, and at the same time, it has to cooperate with drums.
Instructions transmitted by drums alone are limited. And it is easy to be mastered by the enemy. When the military war is in a favorable state, direct withdrawal will not lead to important losses, but if it is at a disadvantage and the withdrawal signal is mastered by enemy soldiers, it will lead the enemy to pursue victory and even lead to greater casualties. Then why do you have to knock on the golden bell when withdrawing troops? In the war, every soldier is very nervous. Besides remembering complicated flags and instructions, he has to fight the enemy.
Therefore, the sound of withdrawing troops must be easy to identify, and the interference of hitting the sword must be eliminated. Moreover, sound should spread as easily as drums and need to spread to the whole battlefield. Due to the limitation of ancient conditions and the requirement of drum matching, ringing gold is the best instruction to retreat.