All these humane rules could well be observed by any ordinary cruiser; and they were, in fact, kept by the _Emden_ and other German cruisers when harrying British commerce in the East. But it is obvious at the first glance that a submarine would be continually in difficulties over them. It would always be risky for so fragile and unhandy a vessel to board and search a big ship, which might prove to be armed with guns or bombs. No submarine could find room for merchant crews or passengers in her own small compartments, and no submarine could afford to spare a prize crew for even one prize, or the time and horse-power to tow her into port. In short, it was plain, from the first, that the legitimate cruiser game could not be played at all by submarine boats. The Government of the United States put the truth unanswerably in these words: ‘The employment of submarines for the destruction of enemy trade is of necessity completely irreconcilable with the principles of humanity, with the long existing undisputed rights of neutrals, and with the sacred privileges of non-combatants.’ [Illustration: ‘Turning passengers and crews adrift in open boats.’ [_See page_ 77. ] The British Navy had an advantage here--the inestimable advantage of a force that could keep the sea against all its enemies. It was, therefore, possible for our submarines to stop an occasional ship with impunity, or to call up a destroyer and send a prize into port; and in the narrow waters of the Baltic and the Sea of Marmora, supply ships and merchantmen were captured and destroyed by them with every regard for the laws of humanity. But the German submarines had no fleet at sea to back their attempted blockade, and German war policy therefore took the downward course, hacking a way through the rules, and sacrificing, for the hope of victory, the very foundations of civilised human life. The U-boats began by turning passengers and crews adrift in open boats, no matter in what weather or how far from land. They went on to sink even great liners without search, and without warning; and they came finally down to the destruction of helpless men and women in boats, in order that the ships they had torpedoed might disappear without a trace--_spürlos versenkt_. CHAPTER VI SUBMARINE _v._ WAR-SHIP