To-day the telephone is the real bond of union between all units serving at the front, from the observer crouching in his advanced post to the commander-in-chief. It links those who issue commands with those who obey them, the lowest with the highest, and makes it possible for all efforts directed towards a single end to be correlated most efficiently in the performance of the common task. If so bold a comparison may be permitted, the telephonic network is the nervous system traversing the huge body of an army in action. The best mode of showing the prime importance of this network is to give some figures, which certainly exceed all the calculations that the layman would be likely to make. Would he imagine, for instance, that, by about the middle of the year 1917, the telephone wires of a single sector held by the Belgians had a total length greater than half that of the equator, or exactly 21,950 kilometres? It is not difficult to realise what labour was needed to install such a system. The innumerable wires and posts had not merely to be put in place, but to be protected from destruction, sheltered against incessant bombardment, and repaired at once if unavoidably damaged. In the most dangerous areas the wires had to be buried deep, or, where they crossed flooded areas, laid under water. This meant the excavating and filling-in of hundreds of kilometres of deep trenches before the delicate work of burying wires and cables was completed. The 21,950 kilometres of wires in the Belgian front system are made up of 6,600 kilometres of buried or submerged wires and 15,350 kilometres of aerial line. The telephone instruments in use number nearly 8,000; the exchange switch-boards, not far short of 1,000. Let us add that this network requires unremitting attention, and that it is being extended and improved daily, and we shall have said enough to give an idea of the prodigious task accomplished by the special corps entrusted with the management of this arduous undertaking. 7. _The Batteries._--The Belgian Army began the war with but a limited supply of 75-mm. guns and hardly a couple of dozen 149-mm. and 150-mm. howitzers; so that it was for a long time compelled to face its powerfully equipped enemy on very unequal terms, a state of things which gave rise to much anxiety. Its battery crews, however, though so seriously handicapped, always fought with remarkable courage and technical skill. During the violent battle of the Yser, especially, their self-sacrifice and devotion won the deepest admiration: and they were also largely responsible for the heroic stand which will be one of the most glorious pages in our army's history.