The German long range guns which bombarded Paris and Dunkirk and other places were set on permanent steel and concrete foundations, and therefore were immobile, and the military efficiency of their shells was reduced by the fact that they were small and made for long flight. The enormous shells of the American guns had a range of thirty miles, weighed 400 pounds each, seven times as much as the German, and could penetrate eight feet of solid concrete. Each gun, without its mount, weighed more than a hundred tons. They fired heavier projectiles and had a greater range than any mobile land artillery that had previously been used. Their chief usefulness was in the destruction of ammunition dumps and of railroad yards and rolling stock and the consequent demoralization of the enemy’s transportation system. When the shells from one of the guns were directed upon the railroad stations and yards of Montmedy and Longuyon they stopped all traffic there and one which struck the German headquarters killed twenty-eight members of the general’s staff. Cruising through France like battleships on wheels, demonstrating their perfect mobility and proving their usefulness by cutting the enemy’s lines of communication and seriously obstructing his transportation, these big naval guns on railway mounts proved their value so triumphantly that the Navy had been requested, when the end came, to provide as many more as it could rush quickly to the front. The Navy also removed a number of 7-inch guns from battleships, the changed conditions of warfare demanding a lighter and quicker firing gun, and devised for them, at General Pershing’s request, a new type of mount, utilizing the principle of the caterpillar belt and thus making it possible for them to travel directly over any kind of ground. So satisfactory were the first tests that the Army asked the Navy to furnish 36 such guns and mounts as quickly as possible and these were being rushed to completion when the armistice was signed. The Navy maintained a large personnel and carried on considerable operations on shore both in Great Britain and France. On the coast of each of these countries was a series of bases for the repair and upkeep of escorting and patrolling ships, from cruisers to converted yachts. In many cases it was necessary to construct complete repair plants. At every naval base overseas there was a fully equipped hospital. In Scotland the Navy took over an entire watering place whose hotels, bath-houses and other structures were converted into large hospital buildings wherein were cared for many British as well as our own sick and wounded. CHAPTER XIII THE WINGS OF THE NAVY