[Illustration: NORMAL TRAFFIC AT THE FRONT INTERNATIONAL FILM SERVICE CO., INC.] All work in the zone is done by three classes of workers, excluding the necessary military operations carried on by the troops in action. First, there are the German prisoners who do every kind of work out of the zone of fire. Then there are the French prisoners in the army, who have committed some military crime, from sneezing in ranks to shooting a colonel. Instead of serving time in a guardhouse, these are put in the front-line trenches and kept there unarmed to build up the parapet, attend to the drains, stop Boche bullets, and perform other functions. If, for instance, a French soldier sends a letter through the civil instead of the military mails, where the censorship is more strict, he receives a thirty days’ sentence. If these prisoners make a suspicious move they are shot by their own men. Second timers are rare, but many serve life sentences. Then there is the third class, a regular branch of the army, a subdivision of the engineers, termed _pionniers_. The engineers do the nastiest work in the army, and the _pionniers_ do the nastiest work in the engineers. It is their duty to see that the wire is properly cut before a charge, that the parapet is in repair and does not lack sandbags,—and it is in this class that the roadbuilders come. All along the roads lie piles of broken stone, which are continually replaced by loads from the rear. At intervals are placed _abris_ filled with roadbuilders who watch until a shell hits the road in their sector. Then, almost before the dirt settles, they rush out armed with shovels, and pile this rough stone into the hole and rush back again to shelter, to wait for the next shell, which is not long in coming. This rough patching is consolidated later when the sector quiets down, but does admirably for the time-being, as the mud and traffic push it rapidly into shape. Steam-rollers are then sent up to finish the work, but find themselves _persona non grata_ when left over night in the middle of a narrow and muddy road, with no lights showing. We _ambulanciers_ are not fond of the species at any time, as they seem to have a great affinity for six-inch shells. When disintegrated, any one of the numerous parts blocks our way. We are perfectly content to have the task left to the simple roadbuilder, who proves less of an obstruction after meeting a one-fifty. * * * * * MANY undeveloped instincts lie dormant in the subconscious mind of man. In this war, where man has turned back the pages of civilization to live and act for a period of time as a glorified cave-dweller, a number of these unknown faculties have been discovered and developed.