In ancient wars, the most important thing in the battle between the two armies is not the number of your troops, whether the city is strong or not, nor how brave and skillful the soldiers are, but the most important thing is munitions and food. Soldiers are brave and good at fighting, and sometimes they go hungry. If the food behind is not delivered, the soldiers fighting in front will not be able to fight at all.

There is an idiom called Liangcaogou. In fact, in ancient times, transporting grain and grass was not only the rice and flour eaten by soldiers, but also the forage needed by war horses. Grain is rice and flour eaten by soldiers, and grass is forage eaten by horses. The trench refers to some alternative weapons or weapon accessories, such as some bows and arrows, shields against arrows and rain, or a series of weapons used by soldiers such as knives, halberds and spears. In addition to the weapons used by these foot soldiers, we also use large-scale equipment to attack the city, such as siege ladders, rushing cars, moat bridges, crashes, catapults and other things that cannot be carried in large marches. Some also have tents, kerosene and other items.

Since ancient times? The soldiers and horses have not moved, and the food and grass go first? It can be seen from this sentence that when the two armies are at war or one side is attacking the city, it is necessary to transport grain and grass or siege materials to the camp near the battlefield for later use. After the food before the battle is finished, logistics personnel are needed to transport the materials to the battlefield. Moreover, in ancient wars, if one side exposed the position of grain and grass, the other side would definitely raid the grain and grass camp, and that side would have failed if it lost grain and grass.

For example, during the battle of Guandu in the Three Kingdoms period, Yuan Shaobing would have more food, and Cao Cao's recklessness was useless. Later, a large part of the reason for his victory was that Xu You went to Cao Cao at night to take refuge in Cao Cao and told Cao Cao that the place where Yuan Shaobing put food and grass was in the Wu Dynasty. Cao Cao attacked the Wu Dynasty at night, which broke the foundation of Yuan Shaobing's war and led to the final failure. The failure of Guandu War was closely related to grain and grass, so grain and grass played a very, very important role in ancient wars.