Orders came in from Brigade for an elaborate counter-battery shoot with gas shell, in two parts, one between 11 p.m. and midnight, the other between 2 and 3 a.m. We had never fired gas shell from six-inch howitzers before, though we had been warned that we should soon be required to do so. We had no gas shell in the Battery, but we were informed by Brigade that a sufficient quantity would arrive by the time the shoot was to begin. In fact, however, the first consignment of gas shell was not delivered in time to enable us to take part in the first part of the bombardment, and I was told not to fire high explosive instead, as that would tend to disperse the gas which other Batteries would be simultaneously firing on the same targets. The method adopted on this and later occasions, when gas was used, was that a number of our own Batteries should concentrate for, say, five minutes at the fastest rate of fire possible on a particular enemy Battery, then all switch together to another enemy Battery, and so on, all coming back together on to the first enemy Battery after an interval sufficient to lull the human elements forming part of the target into a delusive sense of security and a return to slumber without their masks, or, alternatively, to make them wear their masks continously for prolonged hours of expectation, thus subjecting them to much discomfort, depriving them of sleep, lowering their morale, and making them likelier victims for fresh forms of devilment in the morning. War is a filthy thing, and must be stamped out ruthlessly. The facts of gas will have helped to drive this simple conviction into many a thick, egotistical, unsensitive head. But, as has been wisely said, you cannot half make a war of the modern sort, you cannot let a faint savour of regret hang about all your actions, and enervate your will. And, in plain, brutal truth, our employment of gas was a big factor in determining and hastening the end. Of the military efficiency of our gas tactics we had much evidence later on.