Thanks Courtney, nice recap - a lot of people are discussing whithout knowledge of events.
Then General Lord Gort, the commander of the British Expeditionary Force took the morally courageous decision to abandon his role in a projected Anglo-French counterattack, and fell back on the Channel ports... ...The French, not surprisingly, regarded this as a betrayal
In clear English, they ran away ( otherwise, they would have been surrendering like the others, like for exemple the Soviets one year later who had to drop their weapons, by hundred of thousands, after being surrounded in huge battles )
And the French Army had to protect the reimbarkment of British Forces at Dunkirk, without being able to take advantage of the escape route...
No wonder the Battle of Dunkirk is conveniently forgotten North of the Channel....