Naturally the trenches do not run straight. They bend in and out at sharp angles in order to localize the explosions of shells; they are so narrow in most places that two men can pass with difficulty. A few soldiers are on guard, the rest may be lying about their dugouts or probably engaged in building new traverses or in putting up new layers of sandbags or deepening their dugouts. They become beavers rather than warriors, day laborers with spade and shovel rather than knights. There is no marching and countermarching; they have no use for the skirmish drill or the maneuver ground. Sharpshooters with clamped rifles watch for a target patiently as fishermen for a bite. Back from the first line trench runs a winding communication trench, a foot or more deeper than the average man's height and the turns in its walls stop any bullets which otherwise might sweep its length in enfilade. In the reserve trenches are other men in burrows who have not even the excitement of sniping. They do nothing but wait and dig, repairing damages wrought by occasional shells on dull days. At any hour the enemy may suddenly decide to attack and they may find their houses pounded down about their heads and perhaps half of a company wiped out in a quarter of an hour. Then other communication trenches lead back until finally you are in the open country out of the range of bullets, but not outside the range of shells. Here the munition caissons and the transport wagons come up by night bringing the food for men and guns which is taken up to the hungry mouths under the cover of darkness; and here, on an average day, one will occasionally observe the passing of an ambulance with its green roof and sides which melts it into the road and the landscape--and processions of ambulances when there is battle. All the detail of army existence is as precise as that of the best organized industrial plant. As you walk along you will spy at intervals a hidden battery, perhaps in a house, perhaps in a hedge, perhaps in a group of trees, perhaps beautifully roofed over with sod, so that it is invisible from the air. You rarely look up without seeing an aeroplane flying overhead. When there is action, you will see many. A faint pur comes out of the heavens and two planes are seen circling as they exchange bullets from their machine guns. Another plane is turning to the right and left and ducking to avoid the thistle blows of smoke which burst from the shrapnel shells fired by the antiaircraft guns.