The use of the submarine for attacking war-ships is, of course, perfectly legitimate, and the powers and possibilities of this weapon were much discussed before the War. Some writers of note believed that the day of the big battleship was practically over--that such vessels could be ‘pulled down’ with certainty by any enterprising submarine commander, without any corresponding risk to his own boat. Others, with cooler or more scientific heads, maintained that there is an answer to every weapon, and that the introduction of submarines would not change the principles of war. The result has shown that the latter school of opinion was right. The submarine has achieved some striking successes here and there against the larger ships of war, but has not rendered them obsolete or kept them from going about their true business, the control of the sea; and as time goes on, it is rather the submarine than the battle-ship which is found too vulnerable to challenge a fight, when neither has the advantage of surprise. This legitimate use of the submarine formed part, as we have seen, of both British and German war policy--though, in our own case, it was originally considered rather as a means of defence against invasion; than of offence on the high seas. It was, therefore, not unnatural that the U-boat should score first. Besides, we were offering a hundred targets to one. Our cruisers were all over the North Sea, while no German ships could be met there except an occasional mine-layer like the _Königin Luise_. This state of things has only become more invariable as the War has developed; and the most remarkable result, so far, of the contest between the two submarine services is the practical equality of the score on the two sides. With infinitely fewer and more difficult chances, the British submarine has actually surpassed the U-boat’s record, in successes obtained against enemy ships of war, and immensely surpassed it in the proportion of successes to opportunities. The first war-ship to fall to the torpedo of a submarine was the _Pathfinder_, a light cruiser of about 5,000 tons, with a complement of 268 officers and men, of whom some half were saved. The boat which sank her was the U. 21, commanded by Lieutenant Hersing, who raised high hopes in Germany which he was not destined to fulfil.