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While the French army was large and had been well resourced, it had not been modernized. It was still based on the idea that the next war would resemble the Great War. As a result, the French did not believe that any war with Germany, would be a mobile one, but rather a war of attrition. This meant that they failed to develop tank tactics that took advantage of their tanks offensive capabilities.<ref> Copper, p, 137</ref> Even when the French did field effective equipment, such as the SOMUA S35 tanks, they were mismanaged by French calvary commanders. The Somua S35 tanks did not realize their true potential until they were commandeered by German commanders and utilized on the Eastern Front. During the invasion, German Panzer tanks quickly overcame the French defenses on the plains of Northern France. The French air forces were also not a 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 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 own 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 Nazi 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>