Why was France defeated in 1940?
In September 1939, the German war machine invaded Poland and World War II began. France and its Britain declared against Germany in 1939. The French army was in theory as strong as the Germany's. It had a vast Empire and a sophisticated arms industry. It had also established a series of fortifications along the eastern border of the country along Germany, known as the Maginot Line. The Line was designed to keep German forces out of France. Initially, France and Great Britain appeared to be a match for Germany. However, in a period of weeks in the late spring and early summer of 1940, it became clear that that France was woefully unprepared for the German onslaught. France suffered a humiliating defeat and was quickly occupied by Germany. Its failure was a result of a hopelessly divided French political elite, a paucity of quality military leadership, rudimentary French military tactics. On the battlefield France faced a vastly more prepared German army that utilized both more advanced weapons and sophisticated tactics. It was a mismatch.
France had been fearful of Germany ever since the Franco-Prussian War of 1870-71. In this war, the Prussians had quickly defeated the French and occupied much of the country. In World War I, The Germans had come very close to defeating the French and without allied assistance the country would have lost to Germany. Despite being among the victors in World War One the French still dreaded a conflict with Germany. During the Versailles treaty negotiations after the collapse of Germany during World War, French negotiators were adamant Germany's military had to be neutralized.
The French initially led by Prime Minister Clemenceau, adopted a hard line towards the Germans in 1918-1919. There was a thaw in the Franco-German relationship in the mid-1920s and there was hope of a genuine rapprochement between the two greatest powers in continental Europe. However, the Great Depression and the rise of Hitler meant that the French were suddenly faced with a potentially aggressive regime in Germany. The French adopted a diplomatic policy of appeasement and sought to placate Hitler by offering him concessions, such as allowing him to re-militarize the Rhineland. The French took no chances and began to prepare their defenses.
The French devoted a huge amount of resources and capitial to the construction of the Maginot Line. This defensive line was named after a French Defence Minister. The French constructed a long line of fortifications along their eastern border with German. It stopped at the Belgian border. The French stationed all their forces behind the Maginot Line and adopted a defensive posture. In September 1939, the French with the British declared war on Germany after Hitler invaded Poland. For several months, there was little or no activity on the Western Front. This period was known as the ‘Phoney War’. However, in the Spring of 1940, the Germans shifted their attention west and went on the offensive.
The Battle of France lasted only 46 days, from the German invasion on the 10th of May to the surrender of France on the 25th of June 1940. Paris fell to the Germans on the 14th of June, after the virtual collapse of the French Army. French Prime Minister Paul Reynaud resigned on the 16 June during the catasptrophe. His successor, Marshal Philippe Pétain, began negotiations to end the war. The German army approximately suffered 157,000 casualties in the invasion of France. The Allies lost over twice as many men, with 360,000 casulaties. A further two million were captured. Some 300,000 British and French troops escaped the Germans after being evacuated by naval forces at Dunkirk. The Germans occupied the majority of France. In the south of France, the Vichy Regime established a semi-autonomous political entity. Vichy maintained control over the majority of the French Colonies. 
Superior German Army and tactics
The German army developed the Blitzkrieg tactics. This was a tactic based on high-speed and mobile attacks on the enemy’s weak points and it proved devastating in France. The German victory was founded on a plan developed by the great military strategies, General Erich von Manstein. He adopted the Schlieffen Plan that was used so nearly successful in WW I. However, rather than advance on a broad front through Belgium, the Germans focused two-thirds of their forces, including most of their tanks, in the Ardennes region of Belgium. This area was weakly defended, as they believed that the terrain was unsuitable for tanks. When the Germans did attack through the Ardennes they caught the French and their British allies by surprise.
French believed it was impassable to tanks. Having successfully made their way into France, German forces then employed a tactic known as the ‘sickle stroke’. Sweeping across the northern plains of France at great speed, they divided the French and British forces into two parts. The British army was left isolated in Belgium and the French were left to bear the brunt of the German forces .
The German army was much superior to the French and the British. Hitler had built up the Germany army and in particular the air force (Luftwaffe). The Germans had developed superior weapons. In particular, they had developed superior aircraft such as the Stuka dive bomber and the Messerschmitt ME fighter plane, that wreaked havoc on the allies . The Germans placed a great deal of emphasis on mobile and armoured warfare. They had superior tanks, such as Panzer Mk iv, which easily overcame the allies in almost every tank engagement in the Battle of France. It must be remembered that although the German army was superior to the French in many ways, that this did not mean that the Fall of France was inevitable.
French Tactics and Equipment were Poor
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.
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. 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.
Poor Military and Political Leadership
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. 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.
France was bitterly divided between the left and the right. This lack of unity in France was crippling at a crucial juncture in the war. The division also extended to the relationships between the military and political leadership of France. The French Generals were rights wing and distrusted the left wing politicians who ran France. French ministers also did not trust the judgement of their generals. The French officer corps was more worried about a Communist revolution than a German invasion. For example, General Weygand was more concerned with maintaining social stability in the wake of the German invasion than actually fighting the Germans. Many later accused some French Generals of being traitors. Perhaps the greatest weakness in the French leadership was that they did not have a true war leader; as one Frenchman stated in 1942 they ‘had no Churchill’. If France had a leader of the calibre of Clemenceau in 1940, perhaps the outcome of the Battle of France could have been different. 
Defeatism in France
France was a powerful country with a large army and a vast Empire that stretched around the globe, but it was not cohesive. It had stark political conflicts and many politicians were more loyal to their political party than their country. People on both the extreme Left such as the Communists or the extreme right hated the French government so virulently, their support of the French government be best described as half-hearted after the German invasion. Many ordinary people were disgusted with the leaders of the Third Republic, who were widely seen as professional politicians who were both venal and corrupt. Furthermore, defeatism was rampant at the start of WW II. France had a low birth rate and many were convinced that the country was degenerating, based on ideas current at the time.  The cultural pessimism in France meant that many, in the political and military elite believed that France could not defeat Germany and that any efforts to resist the Germans were pointless. Many people believed that France was a nation in decline and that her greatest days had passed. This led to a spirit of defeatism in France in the Spring and Summer of 1940, that played an important role in the Fall of France. Despite the valiant efforts of many French men against the German invasion, the French government and military were ill-equipped both politically and militarily to meaningfully contest Germany. 
While France was protected by the Maginot Line and a fairly large army it put up little resistance to Germany. It only took a few weeks for the enitre country to fall. The reasons for the sudden defeat of France in 1940 were numerous and varied. They included a failure of leadership, both at the military and the political level. The army of France was not only poorly led but had been equipped with inferior arms and equipment. Moreover, the Maginot Line not only failed to protect France, but it encouraged a defensive mentality that allowed the Germans to take the initiative at crucial points during the invasion. The French public were also bitterly divided. These political divisions and incompetent leadership convinced many French citizens that their country could not defeat Germany. All these combined factors combined ensured a swift between May and June 1940.
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- Why Did the French Army Collapse So Quickly? – Omnibooks Magazine, (London July, 1942), p. 6
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- Bloch, Marc, Strange Defeat: A Statement of Evidence Written in 1940 (New York, NY: Norton, 1946), p. 117
- Copper, p, 144