And then, for many mornings to follow, the sound of the Anarchist attacks on the other side of Huesca. Always the same sound. Suddenly, at some time in the small hours, the opening crash of several score bombs bursting simultaneously – even from miles away a diabolical, rending crash – and then the unbroken roar of massed rifles and machine-guns, a heavy rolling sound curiously similar to the roll of drums. By degrees the firing would spread all round the lines that encircled Huesca, and we would stumble out into the trench to lean sleepily against the parapet while a ragged meaningless fire swept overhead.

In the day-time the guns thundered fitfully. Torre Fabián, now our cook-house, was shelled and partially destroyed. It is curious that when you are watching artillery-fire from a safe distance you always want the gunner to hit his mark, even though the mark contains your dinner and some of your comrades. The Fascists were shooting well that morning; perhaps there were German gunners on the job. They bracketed neatly on Torre Fabián. One shell beyond it, one shell short of it, then whizz – BOOM! Burst rafters leaping upwards and a sheet of uralite skimming down the air like a flicked playing-card. The next shell took off the corner of a building as neatly as a giant might do it with a knife. But the cooks produced dinner on time – a memorable feat.

As the days went on the unseen but audible guns began each to assume a distinct personality. There were the two batteries of Russian 75-mm guns which fired from close in our rear and which somehow evoked in my mind the picture of a fat man hitting a golf-ball. These were the first Russian guns I had seen – or heard, rather. They had a low trajectory and a very high velocity, so that you heard the cartridge explosion, the whizz and the shell-burst almost simultaneously. Behind Monflorite were two very heavy guns which fired a few times a day, with a deep, muffled roar that was like the baying of distant chained-up monsters. Up at Mount Aragón, the medieval fortress which the Government troops had stormed last year (the first time in its history, it was said), and which guarded one of the approaches to Huesca, there was a heavy gun which must have dated well back into the nineteenth century. Its great shells whistled over so slowly that you felt certain you could run beside them and keep up with them. A shell from this gun sounded like nothing so much as a man riding along on a bicycle and whistling. The trench-mortars, small though they were, made the most evil sound of all. Their shells are really a kind of winged torpedo, shaped like the darts thrown in public-houses and about the size of a quart bottle; they go off with a devilish metallic crash, as of some monstrous globe of brittle steel being shattered on an anvil. Sometimes our aeroplanes flew over and let loose the aerial torpedoes whose tremendous echoing roar makes the earth tremble even at two miles’ distance. The shell-bursts from the Fascist anti-aircraft guns dotted the sky like cloudlets in a bad water-colour, but I never saw them get within a thousand yards of an aeroplane. When an aeroplane swoops down and uses its machine-gun the sound, from below, is like the fluttering of wings.