At first, in order to resist the German attack, France spared no effort to build a 20-25 km wide Machnow defense line, which consisted of complex fortresses, fortifications and military facilities, such as border posts, communication command centers, infantry barracks, roadblocks, artillery machine gun positions, anti-tank towers, etc. There are all kinds of underground hospitals, factories, power stations and kitchens. Hundreds of kilometers of defense lines are also connected by underground railways. It can be said that as long as the Germans attack any part of maginot line, the supporting French army will rush to and defeat the enemy in a very short time.
Every soldier's barracks in maginot line are equipped with complete and complex infrastructure, including military dormitories and kitchens. There is even a infirmary, equipped with advanced operating rooms, anti-virus filtering devices, power plants, food storage rooms, refrigerators, water tanks, oil tanks, ammunition depots, and even a library for soldiers to borrow books.
But as a result, the German armored forces did not foolishly attack maginot line, France, but broke through the Ardennes forest, an "insurmountable area" in the eyes of the commander-in-chief of the French army. Through "Operation Sickle", the Germans, like harvesting rice, directly entered the hinterland of France and came to Paris.