From Harwich round to Weymouth sea-transport officers were directed to list all suitable ships up to a thousand tons, and a complete survey was made of all shipping in British harbours. These plans for what was called “Operation Dynamo” proved the salvation of the Army ten days later.

* * * * *

The direction of the German thrust had now become more obvious. Armoured vehicles and mechanised divisions continued to pour through the gap towards Amiens and Arras, curling westward along the Somme towards the sea. On the night of the 20th, they entered Abbéville, having traversed and cut the whole communications of the Northern Armies. These hideous, fatal scythes encountered little or no resistance once the front had been broken. The German tanks – the dreaded “chars allemands” – ranged freely through the open country, and aided and supplied by mechanised transport advanced thirty or forty miles a day. They had passed through scores of towns and hundreds of villages without the slightest opposition, their officers looking out of the open cupolas and waving jauntily to the inhabitants. Eye-witnesses spoke of crowds of French prisoners marching along with them, many still carrying their rifles, which were from time to time collected and broken under the tanks. I was shocked by the utter failure to grapple with the German armour, which, with a few thousand vehicles, was compassing the entire destruction of mighty armies, and by the swift collapse of all French resistance once the fighting front had been pierced. The whole German movement was proceeding along the main roads, at no point on which did they seem to be blocked.

Already on the 17th I had asked the Chief of the Air Staff: “Is there no possibility of finding out where a column of enemy armoured vehicles harbours during the dark hours, and then bombing? We are being ripped to pieces behind the front by these wandering columns.”

I now telegraphed to Reynaud:

21.V.40.

Many congratulations upon appointing Weygand, in whom we have entire confidence here.

It is not possible to stop columns of tanks from piercing thin lines and penetrating deeply. All ideas of stopping holes and hemming in these intruders are vicious. Principle should be, on the contrary, to punch holes. Undue importance should not be attached to the arrival of a few tanks at any particular point. What can they do if they enter a town? Towns should be held with riflemen, and tank personnel should be fired upon should they attempt to leave vehicles. If they cannot get food or drink or petrol, they can only make a mess and depart. Where possible, buildings should be blown down upon them. Every town with valuable cross-roads should be held in this fashion. Secondly, the tank columns in the open must be hunted down and attacked in the open country by numbers of small mobile columns with a few cannon. Their tracks must be wearing out, and their energy must abate. This is the one way to deal with the armoured intruders. As for the main body, which does not seem to be coming on very quickly, the only method is to drive in upon the flanks. The confusion of this battle can only be cleared by being aggravated, so that it becomes a melee. They strike at our communications; we should strike at theirs. I feel more confident than I did at the beginning of the battle; but all the armies must fight at the same time, and I hope the British will have a chance soon. Above is only my personal view, and I trust it will give no offence if I state it to you.

Every good wish.

* * * * *

Weygand’s first act was to cancel Gamelin’s Instruction No. 12. It was not unnatural that he should wish to see the situation in the north for himself, and to make contact with the commanders there. Allowances must be made for a general who takes over the command in the crisis of a losing battle. But now there was no time. He should not have left the summit of the remaining controls and have become involved in the delays and strains of personal movement.