Of a gun-detachment there are two men who cannot do their work accurately in gas-helmets--one of these is the layer and the other is the fuse-setter. If the infantry were to be saved, two men out of the detachment of each protecting gun must sacrifice themselves. Instantly, without waiting for orders, the fuse-setters and layers flung aside their helmets. Our guns opened up. The unmasked men lasted about twenty minutes; when they had been dragged out of the gun-pits choking or in convulsions, two more took their places without a second's hesitation. This went on for upwards of two hours. The reason given by the gunners for their splendid, calculated devotion to duty was that they weren't going to let their pals in the trenches down. You may call their heroism devotion to duty or anything you like; the motive that inspired it was love. When men, having done their “bit” get safely home from the Front and have the chance to live among the old affections and enjoyments, the memory of the splendid sharing of the trenches calls them back. That memory blots out all the tragedy and squalor; they think of their willing comrades in sacrifice and cannot rest. I was with a young officer who was probably the most wounded man who ever came out of France alive. He had lain for months in hospital between sandbags, never allowed to move, he was so fragile. He had had great shell-wounds in his legs and stomach; the artery behind his left ear had been all but severed. When he was at last well enough to be discharged, the doctors had warned him never to play golf or polo, or to take any violent form of exercise lest he should do himself a damage. He had returned to Canada for a rest and was back in London, trying to get sent over again to the Front. We had just come out from the Alhambra. Whistles were being blown shrilly for taxis. London theatre-crowds were slipping cosily through the muffled darkness--a man and girl, always a man and a girl. They walked very closely; usually the girl was laughing. Suddenly the contrast flashed across my mind between this bubbling joy of living and the poignant silence of huddled forms beneath the same starlight, not a hundred miles away in No Man's Land. He must have been seeing the same vision and making the same contrast. He pulled on my arm. “I've got to go back.” “But you've done your 'bit,'” I expostulated. “If you do go back and don't get hit, you may burst a blood vessel or something, if what the doctors told you is true.” He halted me beneath an arc-light. I could see the earnestness in his face. “I feel about it this way,” he said, “If I'm out there, I'm just one more. A lot of chaps out there are jolly tired; if I was there, I'd be able to give some chap a rest.”