First: cheer for the warriors who went out and hope they can win the battle.
Ancient soldiers liked to drink, but they had little chance to drink after joining the army. Therefore, the purpose of letting soldiers drink before going out to war is to cheer them up and hope that they will remember the feeling of drinking. If you win, you can get drunk when you come back. It's very imposing when throwing bowls. With so many people throwing bowls together, the momentum will be even greater. So with such encouragement, soldiers will feel full of fighting spirit.
Second: this is a sense of ritual when going out.
In fact, in ancient times, we also attached great importance to the sense of ceremony, especially when going out to war. If the king doesn't say anything when the soldiers go out, then these soldiers will feel that they are not valued and have no confidence. Fighting is a test of soldiers' mentality. If the soldiers on one side are on a roll, they will naturally have greater confidence. If they have no confidence to fight, it will be even harder to win.
Therefore, in order to reassure the soldiers, the king had a ceremony of drinking and smashing bowls before the war. Whenever an army sets out to fight, such a ceremony will be held. Maybe the soldiers can't see the king at ordinary times, but at the ceremony, the king toasted the soldiers, and when the bowl was broken, the soldiers would definitely start with more confidence.
Third: show the determination of the soldiers.
Most people are very excited when throwing bowls. Drinking and throwing bowls before going out is to show the determination of these soldiers, not only to show the confidence of generals and kings, but also to show the determination of soldiers to die. This can not only inspire soldiers, but also inspire generals to unite the army. Because once on the battlefield, it is difficult to get together so thoroughly.