The risks that have to be run by the defender are more trying than those which an assailant, who is presumably the stronger at the point of attack, must dare. Where very long fronts are concerned, they can only be met by strong mobile reserves which can rapidly intervene in a decisive battle. A weight of opinion supports the criticism that the French reserves were inadequate, and, such as they were, badly distributed. After all, the gap behind the Ardennes opened the shortest road from Germany to Paris, and had for centuries been a famous battleground. If the enemy penetrated here, the whole forward movement of the Northern Armies would be deprived of its pivot, and all their communications would be endangered equally with the capital.
Looking back, we can see that Mr. Chamberlain’s War Cabinet, in which I served and for whose acts or neglects I take my full share of responsibility, ought not to have been deterred from thrashing the matter out with the French in the autumn and winter of 1939. It would have been an unpleasant and difficult argument, for the French at every stage could say: “Why do you not send more troops of your own? Will you not take over a wider sector of the front? If reserves are lacking, pray supply them. We have five million men mobilised.2 We follow your ideas about the war at sea; we conform to the plans of the British Admiralty. Pray show a proper confidence in the French Army and in our historic mastery of the art of war on land.”
Nevertheless we ought to have done it.
Hitler and his generals were in little doubt as to the military views and general arrangements of their opponents. During this same autumn and winter the German factories had poured out tanks, the plants for making which must have been well advanced at the Munich crisis in 1938, and bore abundant fruit in the eight months that had passed since war began. They were not at all deterred by the physical difficulties of traversing the Ardennes. On the contrary, they believed that modern mechanical transport and vast organised road-making capacity would make this region, hitherto deemed impassable, the shortest, surest, and easiest method of penetrating France and of rupturing the whole French scheme of counter-attack. Accordingly, the German Supreme Army Command (O.K.H.) planned their enormous onrush through the Ardennes to sever the curling left arm of the Allied Northern Armies at the shoulder-joint. The movement, though on a far larger scale and with different speeds and weapons, was not unlike Napoleon’s thrust at the Plateau of Pratzen in the battle of Austerlitz, whereby the entire Austro-Russian turning move was cut off and ruined and their centre broken.
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At the signal the Northern Armies sprang to the rescue of Belgium and poured forward along all the roads amid the cheers of the inhabitants. The first phase of Plan D was completed by May 12. The French held the left bank of the Meuse to Huy, and their light forces beyond the river were falling back before increasing enemy pressure. The armoured divisions of the French First Army reached the line Huy-Hannut-Tirle-mont. The Belgians, having lost the Albert Canal, were falling back to the line of the river Gette and taking up their prescribed position from Antwerp to Louvain. They still held Liége and Namur. The French Seventh Army had occupied the islands of Walcheren and South Beveland, and were engaged with mechanised units of the German Eighteenth Army on the line Herenthals – Bergen-op-Zoom. So rapid had been the advance of the French Seventh Army that it had already outrun its ammunition supplies. The superiority in quality though not in numbers of the British Air Force was already apparent. Thus up till the night of the 12th there was no reason to suppose that the operations were not going well.
However, during the 13th Lord Gort’s Headquarters became aware of the weight of the German thrust on the front of the French Ninth Army. By nightfall the enemy had established themselves on the west bank of the Meuse, on either side of Dinant and Sedan. The French G.Q.G. (Grand Quartier General) were not yet certain whether the main German effort was directed through Luxembourg against the left of the Maginot Line or through Maastricht towards Brussels. Along the whole front Louvain-Namur-Dinant to Sedan an intense, heavy battle had developed, but under conditions which General Gamelin had not contemplated, for at Dinant the French Ninth Army had no time to install themselves before the enemy was upon them.
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During the 14th the bad news began to come in. At first all was vague. At 7 P.M. I read to the Cabinet a message received from M.
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