THE BATTLE OF FRANCE make a wall. Since the invention of the caterpillar tractor, the scale of the war machine has changed. The sappers are on intimate terms with these monsters. Like the elephant-boys that get their charges to crack nuts for them, they adapt their excavators to a thousand and one jobs. With amazing dexterity the machines drive in the stakes, shift tiny objects, even hand the workers their dinners. 'Your ditch is a fine obstacle, sir,5 I said. c Commanded as it is from all sides by anti-tank guns, I believe it's insuperable/ 'And your anti-tank gunners are accurate?5 'Yes, I was at one of their firing practices the other day. It was quite satisfactory/ I looked around me and saw the powerful, unbroken fortress that ran along the length of our frontiers. I thought of the very similar picture I had just seen in the French lines and remembered then what Winston Churchill once said to me. I met him in London at a time when England seemed very weak as compared with Germany and I had taken the liberty of telling him so. It's quite true,' he replied, 'quite true. But have you ever studied the habits of the lobster?' I had to admit that this was not one of my normal pursuits. 'Well,' he said, 'there are times in a lobster's life when he loses his shell. He secretes a new one 138