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During the invasion, German Panzer tanks quickly overcame the French defenses on the plains of Northern France. The French air forces were also no match for the Germans in aerial combat. The French army was unable to cope with the German Blitzkrieg tactics and was quickly defeated after only six weeks of fighting.<ref>Copper, p, 134</ref>

In 1940, the French general staff was led by General Maurice Gamelan, an officer widely respected. A veteran and war hero of the First World War, he was credited with developing the strategy that led to the decisive French victory at the Marne in 1914. He had also tried unsuccessfully, to modernize the army. But Gamelin was suffering from a serious illness, whose symptoms included poor concentration levels, memory loss and other cognitive difficulties. Gamelin’s memoirs, published after the war, showed symptoms of paranoia and delusions of grandeur.<ref>Jackson, Julian T. <i>[https://www.amazon.com/gp/product/0192805509/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0192805509&linkCode=as2&tag=dailyh0c-20&linkId=aa6895f6029c163adf1d3e187d64e538 The Fall of France: The German Invasion of 1940]</i>. (Oxford UP, 2003), p. 234</ref> The military leadership below Gamelin was generally poor. They were slow to respond to the Germans, and there was a marked reluctance to take any initiative and go on the attack. The political leadership of France was also very poor. According to one French commentator during the war, they could not inspire the French people, they were more interested in fighting among themselves that the Germans.<ref>Jackson, p. 235</ref>