How many mistakes did Poland make in the Polish campaign? Let it fail?

After Germany occupied the whole of Czechoslovakia, southern Poland, northern Poland and western Poland were completely exposed to German vision. At that time, the Polish army realized the danger and assembled a large number of troops behind the natural barrier formed by the Vistula River and the Holy River, but this conservative approach led to the complete abandonment of western Poland, including Silesia coalfield and most major industrial areas.

Due to the extremely slow upgrading of weapons and the extreme lack of modern equipment such as aircraft, tanks, armored personnel carriers, anti-tank guns and anti-aircraft guns, the Polish army can only rely on its primitive cavalry to attack the mechanized parts of Germany. However, in front of the powerful German air force, infantry and cavalry are equivalent to living targets. According to statistics, the number of German planes at that time was more than twice that of Poland. In the face of mechanized Germans, Polish military commanders still use the experience of World War I to direct the battle. They concentrated about one-third of the Polish army in or near the Polish corridor. This deployment directly led to the double encirclement of the Polish army.

The defensive line is too close to the border, but there are no reliable fortifications. Before the Polish troops on foot could retreat to the rear position, they were caught up by the German mechanized troops. Because there are not enough fortifications, there is no room to fight against the torrent of steel. So on the third day, the defenders of Poland were cut off and surrounded by German armored forces. The Germans constantly threatened their rear and cut off the supply line between them and the base, making them feel vulnerable and unable to stand on their feet. These mistakes are inseparable from Poland's overestimation of its own strength and contempt for the enemy.

The failure of the Polish army lies not in its own strength and equipment, but mainly in its strategy. The whole strategy was based on an ignorant fantasy from the beginning, hoping to stop the enemy at the beginning and then fight back after Britain and France attacked Germany. It is hard to imagine that such an action will happen in a country with strong military power. Incredibly, not only did it appear, but the Polish army also carried it out without thinking. The final result was that the main force of the Polish army was surrounded and annihilated by the Germans. In the end, they lost the war and perished again.