And most of the French troops went back to France, ostensibly to fight on. We know how that went. Only a few thousand stayed to join the Free French army.Partially true story - The British covered 1 sector of the front the French the other - It wasn't the case that either legged it and the other did all the fighting (Some British versions have the French running off and the British valiantly holding the Line) Towards the end it was predominantly French units on the Final perimeter - but the fighting withdrawal to buy time to evacuate was done by both.
Fair few British Units were sacrificed in the rear guard as well
You also ignore that of the 350 000 lifted off the beaches over 100K were French.
The Debacle in France 1940 Lies at the feet of successive French Governments who neutered French Army Command and Gamelin who was so confident that Germany was determined to refight WW1 - he committed the armoured reserve to Belgium over protests from French commander - That Force had it remained in Situ could have blocked the Ardennes gap buying time for the Armies to redeploy.
The Ardennes sucker Punch Left the French and British no choice but to retreat and a well fought determined fighting withdrawal it was - not a rout .
There was no force capable of stopping it in France and It was aimed between the Forces in Belgium and their supplies. The Allied Armies didn't really have much choice but to fall back and those on the left flank escape by sea.
Britain took its own troops off 1st - but dont forget it never envisaged getting more than 25000 off and this would keep it in the war so it was a logical decision and of course Troops were landing in France even as the BEF was evacuated.
A well executed German Plan - French Command paralysis and inflexibility are the cause of the debacle - the men on the ground were not. Even 2nd Army which collapsed like a house of cards - did what it could lacking as it did anti tank weapons, anti aircraft weapons and air support - add to that they had spent 12 months digging and building not training - They were never going to stand up to a determined Armoured attack
The Wegland?? line allowed the French to fight the battle their commanders expected - Gave the Germans a quite a bloody nose -