Rundstedt, fortified by Hitler’s verbal agreement, would have none of it. He did not pass on the order to the Fourth Army Commander, Kluge, who was told to continue to husband the Panzer divisions. Kluge protested at the delay, but it was not till next day, the 26th, that Rundstedt released them, although even then he enjoined that Dunkirk was not yet itself to be directly assaulted. The diary records that the Fourth Army protested at this restriction, and its Chief of Staff telephoned on the 27th: “The picture in the Channel ports is as follows. Big ships come up the quayside, boards are put down and the men crowd on the ships. All material is left behind. But we are not keen on finding these men, newly equipped, up against us later.”

It is therefore certain that the armour was halted; that this was done on the initiative not of Hitler but of Rundstedt. Rundstedt no doubt had reasons for his view both in the condition of the armour and in the general battle, but he ought to have obeyed the formal orders of the Army Command, or at least told them what Hitler had said in conversation. There is general agreement among the German commanders that a great opportunity was lost.

* * * * *

There was, however, a separate cause which affected the movements of the German armour at the decisive point.

After reaching the sea at Abbéville on the night of the 20th, the leading German armoured and motorised columns had moved northward along the coast by Etaples towards Boulogne, Calais, and Dunkirk, with the evident intention of cutting off all escape by sea. This region was lighted in my mind from the previous war, when I had maintained the mobile Marine Brigade operating from Dunkirk against the flanks and rear of the German armies marching on Paris. I did not therefore have to learn about the inundation system between Calais and Dunkirk, or the significance of the Gravelines waterline. The sluices had already been opened, and with every day the floods were spreading, thus giving southerly protection to our line of retreat. The defence of Boulogne, but still more of Calais, to the latest hour stood forth upon the confused scene, and garrisons were immediately sent there from England. Boulogne, isolated and attacked on May 22, was defended by two battalions of the Guards and one of our few anti-tank batteries, with some French troops. After thirty-six hours’ resistance, it was reported to be untenable, and I consented to the remainder of the garrison, including the French, being taken off by sea. This was effected by eight destroyers on the night of May 23–24 with a loss of only two hundred men. I regretted this decision.

Some days earlier I had placed the conduct of the defence of the Channel ports directly under the Chief of the Imperial General Staff, with whom I was in constant touch. I now resolved that Calais should be fought to the death, and that no evacuation by sea could be allowed to the garrison, which consisted of one battalion of the Rifle Brigade, one of the 60th Rifles, the Queen Victoria Rifles, and a battalion of the Royal Tank Regiment, with twenty-one Light and twenty-seven Cruiser tanks and an equal number of Frenchmen. It was painful thus to sacrifice these splendid trained Regular troops, of which we had so few, for the doubtful advantage of gaining two or perhaps three days, and the unknown uses that could be made of these days. The Secretary of State for War and the C.I.G.S. agreed to this hard measure. The telegrams and minutes tell the tale.

 

Prime Minister to General Ismay for C.I.G.S.

23.V.40.

Apart from the general order issued, I trust, last night by Weygand, for assuring the southward movement of the armies via Amiens, it is imperative that a clear line of supply should be opened up at the earliest moment to Gort’s army by Dunkirk, Calais, or Boulogne. Gort cannot remain insensible to the peril in which he is now placed, and he must detach even a division, or whatever lesser force is necessary, to meet our force pushing through from the coast. If the regiment of armoured vehicles, including Cruiser tanks, has actually landed at Calais, this should improve the situation, and should encourage us to send the rest of the Second Brigade of that Armoured Division in there. This coastal area must be cleaned up if the major operation of withdrawal is to have any chance. The intruders behind the line must be struck at and brought to bay. The refugees should be driven into the fields and parked there, as proposed by General Weygand, so that the roads can be kept clear. Are you in touch with Gort by telephone and telegraph, and how long does it take to send him a cyphered message? Will you kindly tell one of your staff officers to send a map to Downing Street with the position, so far as it is known today, of the nine British divisions. Do not reply to this yourself.

Prime Minister to General Ismay.

24.V.40.

I cannot understand the situation around Calais. The Germans are blocking all exits, and our regiment of tanks is boxed up in the town because it cannot face the field guns planted on the outskirts.