Engage them in war early, before they become too strong; the best defense is a good offense.
France
The British promise to Poland was different than that of France. The British agreement with the Poles was a bit vague. In fact, England had very few troops to send to France at the time, let alone troops for Poland. On the other hand, the French had committed to Poland real assistance. France had promised Poland almost immediate offensive action at Germany, should Hitler attack Poland. Weeks before Hitler's invasion of Poland, however, the French high military command informed their government that an effective offensive move against Germany might take a year or more to have it ready. Clearly the French government was in a bind. If the military was truthful, then the danger was not about helping Poland, but what would France do if Hitler attacked France?
If the Munich Agreement hadn't been signed, then Hitler's Germany would have invaded and seized all of Czechoslovakia in October 1938. The Czechs would have resisted and a war between Germany & Czechoslovakia would have begun. No other country was in a position or motivated to help.
Napoleon Bonaparte, the Emperor of France, invaded Russia in 1812 that resulted in defeat.
If they hadn't, Hitler's conquering Armies would have rolled right over them - just as they did in France.
In 1936, Hitler decided to take reoccupy the Rhineland. It was very risky as Germany still had a weak army. France had just signed an agreement with the USSR to protect each other against an attck from Germany. Hitler used this to claim that Germany was under threat and that he should be allowed to place troops on his own frontier. He moved his troops to the Rhineland . However, France did not act against this and Hitler took full control of the Rhineland.
While there is debate, croquet was most likely invented in France in the 14th century.
We, of course, have the luxury of high-sight and the simple answer is no. But back in the day it wasn't so easy to tell. The sensible thing for Hitler to have done was to be satisfied with his gains and not keep over-reaching himself. The Allies were hoping Hitler would be sensible and were surprised when he wasn't. Hitler you have to understand kept on over-reaching himself even through-out the thick of the war. (He should have never attacked Russia, or declared war on the US). Now the allies had good reason to not get involved in a war with Germany as the German war machine was good. Look what happened to France. England would have fallen too if Hitler had kept his focus and not gone tearing after the largest military power in the world. (Russia) Now consider the US's war on Iraq. Should they have left Saddam alone or was it better that they end up where they are now?
Both England and France agreed to the conditions of the 1938 Munich Pact because they believed that Hitler would not try to extend German power in Europe after they agreed to having the Sudetenland be annexed by Germany. As it turned out, Hitler had every intention to expand Germany's power in Europe. The Munich Pact gave hope to England and France that there would be no wars in Europe if they agreed to Hitler's demands.
France had wars with England because after William of Normandy's family died out France said it should control Normandy despite the fact that England controlled it ever since 1066. This led to several wars the most famous being the hundred year war.
The Hundred Years War was started over a dispute between England and France over who ruled France. The French king at the time had died, and no male heir was still living. The English king at the time claimed that he was distantly related and should get the throne. A dispute started over whether or not England should really have France, and the war began as a way to settle the dispute.
This refers to a controversial decision by then-British prime minister Neville Chamberlain. Mr. Chamberlain wanted to avoid a war with Germany and came to believe that by giving Hitler some of the territory he wanted, that would cause the German leader to turn away from further aggression. So, Mr. Chamberlain agreed that the Czech region called the Sudetanland should be ceded to Germany. But despite the prime minister's belief he had secured "peace in our time," in the end, appeasing Hitler did not work. Germany subsequently invaded Poland, and England ended up going to war.