Usually, when we often watch TV, there will be such a scene of shouting. For example, when soldiers go to war, generals often shout slogans to soldiers in order to boost morale and encourage them to fight bravely. In the army, the general will put up notices for every soldier to see, and then give them how much money according to their grades. This method is often used in military camps, and the temptation to reward them greatly improves their morale.
When fighting, the general will also shout slogans to the soldiers. When shouting slogans, some places are too far away to hear. At that time, there was no loudspeaker sound, and he relied on human communication, such as passing on what the general had to say to the nearby generals, and then the generals handed down the slogans one by one so that all the soldiers in the army could receive the general's slogans. A slogan is very short, which boosts morale and is very simple to pass on.
The ancients had the wisdom of the ancients. Ten thousand people are determined to kill the enemy and unite as one. Soldiers will be touched and have more courage to face the enemy. Moreover, all kinds of attractive rewards for triumphant return have greatly improved morale. The general's slogan still inspires many soldiers. In addition, when the generals were lecturing, they also chose the lecture place according to the wind direction of the day, used the wind speed to spread the breadth of sound, and also used special instruments to spread the sound further, so the ancients still had many ways.