Because at the beginning, that is, in June of 1940, although the defeat of France was a foregone conclusion and basically irreversible, there was a deputy minister of defense named Charles de Gaulle in the government at that time. Although this man doesn't look so tough, his attitude is very tough. Under certain circumstances, Charles de Gaulle still supported the German invaders, which also saved the face of France at that time.
In the middle and late June of the same year, Charles de Gaulle fled from France to Britain. On the same day, he refused to admit defeat and began to organize army resistance. At that time, he also delivered a speech saying that the French resistance movement would never die! This was the last fireworks that Charles de Gaulle brought to France at that time.
It was not until later that Charles de Gaulle joined forces with various organizations to save France, and finally they succeeded. 1944 In August, Charles de Gaulle led the "Legion" into Paris, and finally recovered his country on August 30, and "free" France officially ended its mission. So everyone said that Charles de Gaulle saved French dignity.