When these places had been passed, and the enemy wire, more or less cut by our shrapnel, had been crossed, our men had to attack the enemy fire trenches of the first line. These, like the other defences, varied in degree, but not in kind. They were, in the main, deep, solid trenches, dug with short bays or zigzags in the pattern of the Greek Key or badger's earth. They were seldom less than eight feet and sometimes as much as twelve feet deep. Their sides were revetted, or held from collapsing, by strong wickerwork. They had good, comfortable standing slabs or banquettes on which the men could stand to fire. As a rule, the parapets were not built up with sandbags as ours were. In some parts of the line, the front trenches were strengthened at intervals of about fifty yards by tiny forts or fortlets made of concrete and so built into the parapet that they could not be seen from without, even five yards away. These fortlets were pierced with a foot-long slip for the muzzle of a machine gun, and were just big enough to hold the gun and one gunner. In the forward wall of the trenches were the openings of the shafts which led to the front-line dugouts. The shafts are all of the same pattern. They have open mouths about four feet high, and slant down into the earth for about twenty feet at an angle of forty-five degrees. At the bottom of the stairs which led down are the living rooms and barracks which communicate with each other so that if a shaft collapse the men below may still escape by another. The shafts and living rooms are strongly propped and panelled with wood, and this has led to the destruction of most of the few which survived our bombardment. While they were needed as billets our men lived in them. Then the wood was removed, and the dugout and shaft collapsed. During the bombardment before an attack, the enemy kept below in his dugouts. If one shaft were blown in by a shell, they passed to the next. When the fire "lifted" to let the attack begin, they raced up the stairs with their machine guns and had them in action within a minute. Sometimes the fire was too heavy for this, for trench, parapet, shafts, dugouts, wood, and fortlets, were pounded out of existence, so that no man could say that a line had ever run there; and in these cases the garrison was destroyed in the shelters. This happened in several places, though all the enemy dugouts were kept equipped with pioneer tools by which buried men could dig themselves out. The direction of the front-line trenches was so inclined with bends, juts, and angles as to give flanking fire upon attackers.