In this pattern, which is shown in detail in the photograph, the compressed nitrogen is contained in a spherical-vessel which is contained inside a ring-shaped oil container. The whole thing looks like a life preserver and is mounted on a light frame so that it can be comfortably carried on the back. For a man who may suddenly have to get down on his stomach and crawl, the apparatus is much more compact and better fitting to the body than the original type, but it has no advantage over the older varieties as regards range or duration. The flexible hose which carries the lighting nozzle is made of canvas and rubber, and enemy documents which have been captured show that only one tube is provided for each three reservoirs. After the discharge of one apparatus the long tube is supposed to be fitted with a new nozzle and handed on to the others in succession. The flammenwerfer companies are divided into squads. Following the German army habit of adopting contractions--a habit presumably forced on them by their cumbersome word-building language, the squads are designated _Groftruppe_ or _Kleiftruppe_, according as they are armed with large or small projectors. The former is a contraction for _Grosser-flammenwerfertrupp_ (large flame projector squad), and the latter for _Kleiner-flammenwerfertrupp_ (small flame projector squad). In the case of attacks with the large projectors, or a combined attack with both sizes, the chief thing is secrecy of installation in the trenches. If it was ascertained or suspected that flammenwerfer were being put in, our gunners would open on the position in no time and blow the apparatus sky-high. As it is necessary to sap out to within 27 yards of our lines in order to get in a “shot,” it can readily be seen that the possibilities of using the large projectors are very limited, and as a matter of fact little use has been made of them. Attacks with the portable projectors are more possible owing to their greater mobility. But here again the essential part of the tactics and the most difficult thing to do is to get near enough the target to make the shot effective. The range is only fifty to sixty feet. The German idea is to cover the advance of the “_Kleif_” men by protecting machine-gun fire. In an attack, the advance of the company is covered by machine-gun fire from each side, converging at a point on the opposing trenches. In the triangle thus formed the attacking force, the “_Kleiftruppe_” in front, then a party of bombers, and finally the raiding or attacking party take up their positions in No Man’s Land and crawl as far forward as possible in the “protected area.” As soon as the flame projectors are within range, the machine guns switch outward to each side, the flame is discharged and the bombers rush in and try their luck in the trench. If things go well, the infantry follows the bombing party and proceeds to its objective.