To realise the difficulty that any enemy would have in bringing such a fleet of transports to our coast and disembarking an army, it is necessary to remember that all the ships operating in Home waters, whether they are in the North Sea, the Channel, or elsewhere, are in wireless communication with the Admiralty and the Commander-inChief, so that if a fleet of transports is sighted anywhere by a single cruiser, or even by a merchant ship if she is fitted with wireless, every ship which happened to be in a position to intercept the transports would at once get the order to concentrate as necessary for the purpose, whether she was at sea or in harbour.
It is further necessary to remember that, even supposing that by some extraordinary lucky chance the transports were able to reach our coast without being detected, their presence must be known when they arrive there; and long before half the troops could be landed, the transports would be attacked and sunk by submarines which are stationed along the coast for that purpose.
Besides the submarines there would be always a large force of destroyers, either in the ports along the coast or within wireless call, as, in addition to those that may be definitely detailed for coast defence, the system of reliefs for those acting over
