It was apparent in the very first encounters that artillery would play a much more important part than had been assigned to it by pre-war theory. As soon as the two opponents had dug themselves in opposite one another, it became evident that strong entrenchments, forming an unbroken barrier along an extensive front, could be mastered only by the number and weight of guns brought into action. We shall say nothing here about the great effort which enabled us to solve the second part of this momentous problem,[C] our immediate object being to demonstrate the intense effort which the fighting army had to put forth in organising the Yser front. When the last struggles of the battle had ceased, our artillerymen vied with one another in the keenness and industry with which they screened their pieces from enemy observation in the open plain whereon they had perforce to establish them. It was impossible to dig into the ground and sink the guns behind solid earthworks. As with the trenches, all structures had to be laboriously fashioned out of imported materials, not merely under the enemy's eyes but under the fire of his formidable artillery. Over and over again the gunners had to cease work in order to reply to the enemy, giving him as much as he gave, and showing themselves always ready for a fight, whatever the odds. The duel over, they picked up their tools, repaired any damage done, and cheerfully carried on. However, thanks to the steady augmentation of Belgian resources, the German superiority gradually disappeared; while, on the other hand, the number of works to be executed increased. As the positioning of mere field-pieces was a very troublesome business, one can guess what was entailed by the installation on such unstable ground of heavy batteries with ponderous platforms to support them. Nevertheless, our men patiently overcame all difficulties. An imposing number of batteries--greater than the public imagines--is now disposed _en échelon_ over the plain. Cannon, howitzers and mortars are hidden so skilfully that they can hardly be detected even at a short distance. Hundreds of concrete shelters have been built for ammunition dumps and headquarters. Among the ruins rise practically indestructible observation posts, themselves invisible from afar, but commanding the whole country. From these a ceaseless watch is kept upon the enemy's lines. Artificial screens protect the works from direct observation, and clever "camouflage" entirely conceals them from overhead view. To mislead the enemy, "dummy" batteries are scattered about everywhere. Many reserve positions have also been prepared so that, should the need arise, the batteries may be shifted and re-concentrated in different sectors.