During World War II, only the Germans did not worry about ammunition. Unless the army is surrounded, materials can't be transported at all. In other words, after the allied forces landed in Normandy, the supply of American troops could not keep up with the millions of American troops fighting in southern France. It relies on the captured German equipment to support it (plus the discovery of German good weapons).
It was not until the allied forces developed the front to the north of France, that is, after Antwerp port in the Netherlands was occupied, that the US military used this port to provide a large amount of materials and transported them to the European continent. This also explains why the ultimate goal of the Battle of Aden in Germany is the Dutch port.
The simple fact is that once the port of Antwerp in the Netherlands is occupied, the allies in the second battlefield will run out of ammunition and food, and the retreat like Dunkirk will repeat itself! Unfortunately, the German paratroopers who waited for the arrival of the German ground troops took control of the main bridge to the Netherlands after airborne, but never waited for the ground troops!
During World War II, Germany set a precedent for modern industrial war. With the large-scale popularization of military vehicles, ammunition supply is no longer a problem. Needless to say, transportation routes in Germany and even Japan are acceptable. The Eighth Route Army, the New Fourth Army and the militiamen on the battlefield behind enemy lines climbed trains and boarded railways all day, ambushing ghost transport convoys, but it did not affect their fighting in the South China Sea at all and occupied most of our country.
Even in 1945, Japan's scenery was exhausted, but it was impossible to fight because of the supply problem. German machine gunner, known as Omaha Beach Monster, is an ordinary soldier of the 352nd Infantry Division of the German Defence Force. His name is Hein Cervero. This is still a fierce battle.
When the German supply couldn't keep up, this man relied on his own standard ammunition and fired 12000 rounds in 9 hours. After the machine gun bullets were used up, he continued to fire 400 rounds with his rifle. He said, kill a regiment of landing troops! After all, compared with the old imperialist industrial powers, we were really poor during the War of Resistance against Japanese Aggression period.
In peacetime, the standard of the troops directly under the army is 60 rounds per soldier, while the basic personnel of other factions have more guns. Two people have less than one gun, one gun has only five bullets, and everyone has only bayonets. German rifleman's standard ammunition is 700 rounds per person, and rifleman has more bullets than our institutional rifleman!
There are also supply trucks to transport ammunition back and forth. The German semi-tracked transport vehicle that we often see in movies and TV is mainly responsible for transporting ammunition to the front line of the battlefield.