Because war is different from fighting, 10 vs 10, just choose a venue and fight directly. But not in a large-scale war. The first is supply, and the most basic thing is food. How much food does a teacher need 10000 people? A person needs 1 kg of meat a day, then 1 teacher needs 15000 kg of meat a day, and a pig needs 100 pigs. If the troops want to stay in a different place for ten days, they need to eat 1000 pigs. If this figure is not supplemented in wartime,
Blitzkrieg in Germany refers to the rapid advance of armored forces, much faster than the retreat of French troops. Then set up a defense line on the only way for the French army to retreat, and cut off the supply and retreat of the French army.
For example, France's supply mainly transited through City A, but City A was occupied by Germany. In World War II, defensive operations were still in an advantageous position in tactics, and it was difficult to attack without superior forces. The superior forces must be assembled through time, but the French army did not expect the Germans to bypass the defense line and raid the French rear. Millions of troops massed on the German-French border. Once the German intention was discovered, it was not as fast as the German armored forces. By the time the key point was reached, the Germans had established a defense line. At this time, the troops assembled behind France were not enough to get through the supply line, and the besieged French army lacked supplies, fuel, ammunition, medicine and food. Food can also be partially collected locally, but fuel, medicine and ammunition can only be consumed. You can imagine how many bullets a soldier can hold, how much 1000 bullets weigh, and how long 1000 bullets can last. Therefore, the troops trapped in the encirclement must break through, but the German armored division only needs to persist for a certain period of time, and the troops in the encirclement will become weaker and weaker.
In fact, this is only the successful principle of blitzkrieg, and the key to blitzkrieg is fast!
In the early period of World War II, the war theory also continued the linear defense of World War I. What is linear defense? In other words, the defense line is straight. Find the key point of the opponent's attack and take the reserve team to make up the position. When the defense line is broken, retreat to the rear and establish a new defense line. But Germany cleverly bypassed the French defense, and the attack speed of pure machinery was much faster than the retreat speed of the French army. When the French reserves and troops arrived at key locations, Germany had established a defense line. At this time, the troops in the encirclement either break through or surrender, but you have to launch an attack to break through. Launching a large-scale attack requires a lot of resources. However, the troops in the encirclement could not get supplies, but became weaker and weaker, and finally had to surrender.
In the late World War II, defense in depth was generally adopted, and the role of blitzkrieg was much smaller.
In the Korean War, although China didn't use blitzkrieg, it used the means of luring the enemy deep, and its strategic effect was exactly the same as that of German blitzkrieg, that is, building a defense line behind the enemy and cutting off the enemy's supplies. But the difference is that at that time, the United States could airdrop supplies, so the United States integrated forces surrounded by volunteers still had strong combat effectiveness. If the troops with supplies break through, they will not weaken their combat effectiveness.