Admiral Beez
Major
In 1871, Germany conquered France, signed a treaty, and then with the exception of small bits of French territory mainly Alsace-Lorraine the Germans left. This was Bismarck's brilliance, crush the enemy, then withdraw so that you needn't cover the expense of occupation.
Let's do the same in 1939-40. Germany defeats France in June 1940. But instead of setting up a Vichy puppet regime, Germany signs a peace agreement with France, and entirely withdraws from French territory. In the Treaty, in exchange for a full German withdraw from French pre-Sept 1939 territory, France agrees not to fight the Germans and to remain neutral with respects to any of Germany's enemies, namely the British Empire. Norway, Denmark and the Netherlands are not so lucky and remain under German occupation. In Italy, having just invaded southern France, Mussolini is not informed of Germany's plan, with Hitler advising Paris that how France dealt with Italy was their concern. In short order the French soundly defeat and oust the Italians from France, leaving a humiliated Mussolini to entreat with the French. Germany now reaches out to Britain for an armistice, meanwhile Italy is now in no condition to commence new offensives in North Africa. What does Britain do now?
Let's do the same in 1939-40. Germany defeats France in June 1940. But instead of setting up a Vichy puppet regime, Germany signs a peace agreement with France, and entirely withdraws from French territory. In the Treaty, in exchange for a full German withdraw from French pre-Sept 1939 territory, France agrees not to fight the Germans and to remain neutral with respects to any of Germany's enemies, namely the British Empire. Norway, Denmark and the Netherlands are not so lucky and remain under German occupation. In Italy, having just invaded southern France, Mussolini is not informed of Germany's plan, with Hitler advising Paris that how France dealt with Italy was their concern. In short order the French soundly defeat and oust the Italians from France, leaving a humiliated Mussolini to entreat with the French. Germany now reaches out to Britain for an armistice, meanwhile Italy is now in no condition to commence new offensives in North Africa. What does Britain do now?