One of the most striking features of modern naval warfare is the absolute revolution in methods of communication brought about by wireless telegraphy. To-day every warship has its wireless installation. Our cruiser squadrons and destroyer flotillas, ceaselessly patrolling the waters of the North Sea, are always in touch with the Admiral of the Fleet, and with the Admiralty at Whitehall. In the Atlantic, and in the Pacific too, our cruisers, whether engaged in hunting down the marauding cruisers of the enemy or in searching for merchant ships laden with contraband, have their comings and goings directed by wireless. Even before the actual declaration of war between Great Britain and Germany wireless telegraphy began its work. At the conclusion of the great naval review of July 1914, the Fleet left Portland to disperse as customary for manœuvre leave, but a wireless message was dispatched ordering the Fleet not to disperse. As no state of war then existed, this was a precautionary measure, but subsequent events quickly proved how urgently necessary it had been to keep the Fleet in battle array. Immediately war was declared Great Britain was able to put into the North Sea a fleet which hopelessly outnumbered and outclassed the German battle fleet. At the outset Germany had a number of cruisers in the Atlantic and the Pacific Oceans. Owing to the vigilance of our warships these vessels were unable to join the German Home Fleet, and they immediately adopted the rôle of commerce destroyers. In this work they made extensive use of wireless telegraphy to ascertain the whereabouts of British merchant ships, and for a short time they played quite a merry game. Prominent among these raiders was the _Emden_. It was really astonishing how this cruiser obtained information regarding the sailings of British ships. It is said that on one occasion she called up by wireless a merchant ship, and inquired if the latter had seen anything of a German cruiser. The unsuspecting merchantman replied that there was no such thing as a German warship in the vicinity. “Oh yes, there is,” returned the _Emden_; “I’m it!” and shortly afterwards she appeared on the horizon, to the great discomfiture of the British skipper. An interesting account of the escape of a British liner from another notorious raider, the _Karlsruhe_, has been given in the _Nautical Magazine_. The writer says: