It must be realised, however, that a common speech between two nations does not necessarily mean that their respective navies talk in the same tongue. The system of signalling in the American Fleet, the significance of flags, the arrangement of codes and ciphers, are peculiarly and completely theirs. The meanings of the flags had nothing in common with the British. Their system has been evolved through generations; is, so to speak, their navy’s mother tongue. The signalmen of the Nth Battle Squadron, blowing on their numbed fingers amid the snows of Ultima Thule, had to forget in twenty-four hours what had been laboriously taught them for years. They had to master a different-coloured alphabet as it is sighted two miles away tangled up in halliards or half obscured by funnel and (mayhap) battle smoke. Manœuvres on a scale they had hitherto regarded as exceptional: Fleet exercises and squadron competition, intership signalese (whereby the movement of a semaphore arm through fifteen degrees of the arc meant things undreamed of in their philosophy), tricks which northern visibility plays with daylight signalling--these things were their daily and nightly portion. In the words of one of them, “it was a tough proposition,” and they tackled it like tigers. In a fortnight they were through with it. In a month the British signal boatswains rubbed their telescope lenses and said they were damned. But the communication problem didn’t end there. Wireless plays an even more important part than visual signalling in naval warfare. It is important enough in peace, and the American Fleet had by no means neglected the subject. But aerial conditions in the region of Manilla differ considerably from those in the North Sea. Speaking radiographically, the North Sea is the most crowded thoroughfare in the world. All through the twenty-four hours ships and submarines and shore wireless stations are talking, talking, talking. British warnings to shipping on its lawful occasions, streams of lies from Berlin (branded at the outset “German Press Message”), cipher cryptograms from three Admiralties, destroyers bleating in a fog, appeals from a hunted merchantman--all these interspersed with the gibbering Telefunken of the German submarine.