The British expeditionary Force in France

After the Germans bypassed "The Maginot Line" in on the Franco-German border, it only took them a month to leave the Allies surrounded and facing total defeat. These withdrew to Dunkirk. Nevertheless, in Dunkirk the advancing German army trapped them. Suddenly, something unexpected occurred, Hitler ordered his army to stop. This decision was extremely harmful to Germany since it gave the British Expeditionary Force the chance to evacuate the place, saving a large part of its army. This is clearly an example of how the British tactics and the German's failures led to the success of the Allies.

In addition, the Royal Air Force was able to outfight the Luftwaffe over Dunkirk.

In spite of all this, it is a fact that these events were not a complete success for the Allies because the BEF was driven out of Europe, many troops became prisoners, the French were left to fight alone and most of the British equipment had been left behind, destroyed or in German hands.