Our troubles were not all caused by artillery fire by any means. Fritz had a large and varied assortment of "Minenwerfer" with which to entertain us at all hours, day and night. A good many people, even among the soldiers themselves, think that Minenwerfer or "Minnie" for short, is the name of the projectile or torpedo, while, as a matter of fact, it is the instrument which throws it; a literal translation being "mine-thrower." In the same way they often speak of the shells thrown by trench mortars as "trench mortars" themselves. Now the family of "Minnies" is a large one and includes every device, from the ancient types used by the Greeks and Romans, with springs of wood, to the latest and most modern contraption in which the propelling power may be steel springs, compressed air or a small charge of powder. In its smallest form it is simply a "rifle grenade," somewhat similar to a hand grenade or ordinary "bomb," to which is attached a rod of brass or iron which slips down into the bore of the regular service rifle and is fired with a blank cartridge. Other and newer types are without this rod but have vanes or rudders affixed to the rear end which serve to guide the projectile in its flight. These usually have a hole through the center through which the bullet passes and can thus be used with the regular service ammunition. This whole class, embracing everything from the small "pineapples," fired from the rifle, to the monstrous "aerial torpedoes," are commonly spoken of as "fish-tails."
The shells from the trench mortars proper, and most of the "fish-tail" family, are somewhat similar to ordinary artillery shells in that they are made of steel or iron and designed to burst into small fragments, each of which constitutes a deadly missile. On the other hand, the "mines" thrown by the Minenwerfer, are merely light sheet-metal containers for heavy charges of high explosives (T. N. T. or tri-nitro-toluol as a rule), and depend for their effectiveness on the shock and blasting effect of the detonation. They have been increasing in size continually. At first we called them "sausages," then "rum-jars" (they resembled the ordinary one-gallon rum jar in size and shape), then they became "flying pigs" and by this time, I have no doubt, new and still more expressive names have been applied to them.