The lack of material ready on wagons for immediate movement to the front left them to gather what material they could on the spot. They could not use barbed wire, and in places that seemed the only thing in sight. They tore out trench timbers, which often proved rotten from four years in moist earth, they gathered stones where stones could be found and used these to make something more solid than loose earth turned by the shovel; and they sent hurry calls to the rear for trucks of material, which themselves might be stalled on the way forward in the jam of waiting traffic. The more sticks and stones filled in a bad spot, the more were needed as the earth underneath continued to yield. When a truck-driver saw that the truck in front, which belonged to his convoy, had passed through a rut, he determined that where his leader could go he could follow, and he drove ahead, cylinders roaring with all their horse-power. When he was stuck, he spurred them to another effort. Meanwhile his wheels were probably sinking, and he had delayed the mending of the break in any satisfactory way while the truck in front backed up to put out a towline, and all hands in the neighborhood added their muscular man-power to cylinder horse-power. The Germans had raised in the shell-torn earth of the trench system another barrier than that of their fortifications to a swift drive for their lines of communication. Their own limited opportunities in "passing the buck" did not exclude the engineers from easing their own mental, if not physical, burden by remarking with acid intensity that a little better traffic control on the part of some of the people who were complaining would help matters. No one who had been along the roads could deny that this point was well taken. If not the experience of other offensives, our traffic demoralization at Saint-Mihiel should have been a warning to us, though most of the men who had learned their lessons in that sector were still occupied there. We had the admirable example of the British transport, which, after confusion in the Somme battle resembling ours at Saint-Mihiel, had developed in practice under fire a system which seemed automatic. The number of guns and ammunition-caissons and the length of a column of divisional transport were calculable quantities. Their order of precedence behind the infantry was largely a settled formula. The number of roads and their state of repair must be known not only on the map but by practical observation. Some were narrow country roads, which would accommodate only "one-way" traffic, and others would accommodate traffic going both ways. Having all these factors in mind, the program must include the disposition of labor battalions where they would be needed in making prompt repairs, when heavy trucks cut up roads, especially one-way dirt country roads.