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[[File:Bundesarchiv_Bild_121-0412,_Frankreich,_Panzer_Somua_S35,_Geschütz.jpg|left|thumbnail|300px|Captured French Somua S35 tanks being used by Germany in 1940.]]

French military tactics were extremely outdated at the start of the war. They had failed to recognize that warfare had fundamentally changed since the First World War. They were over-reliant upon the Maginot Line and they believed that this would stop any German invasion in its track. Since they did not believe that could defeat Germany outright, they hoped that the Maginot would drive up casualties and Germany to the negotiating table. They relied on defensive tactics and failed to grasp the impact of modern tanks and aircraft. This over-reliance on the Maginot Line meant that they were too defensive. The Maginot Line also failed to protect the entire French border. Instead of attacking France directly, Germany avoided the Maginot line by invading Belgium. French military planners has failed to plan for this contingency. The defensive line only partially defended France and indeed left the country open to an invasion via Belgium. The French High Command also failed to launch an offensive against Germany after the German attacked Poland. The French army simply hid behind the Maginot Line and waited for the Germans to attack. When the Germans finally did attack through the Ardennes the French army was trapped in bunkers and its fortifications were immediately outflanked. Even when the Germans invaded Belgium, the French General Staff continued with their cautious policy and were slow to respond to the German threat.<ref> Cooper, M. ''[https://www.amazon.com/gp/product/0517436108/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0517436108&linkCode=as2&tag=dailyh0c-20&linkId=089457e8c42c04ed8e9d351e9727ad63 The German Army 1933–1945, Its Political and Military Failure]''. (Briarcliff Manor, NY: Stein and Day, 1978), p. 201 </ref>

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>