Lined with forts that defied the bombardment of our largest naval guns; protected by minefields that taxed the resources of our most intrepid fleets of sweepers; endowed by nature with an opposing current against which our destroyers, during some of the winter storms, were only able to maintain their stations by steaming ten knots ahead, the Dardanelles, guarding the Sea of Marmora, might well have seemed secure against our submarines. How little they were really so, was, however, made clear by Mr. Asquith in his summary of their achievements up to the end of October, 1915--a couple of months before the evacuation of the Peninsula and our withdrawal from the campaign. Up to that time it appeared, that, between them, they had sunk or damaged two Turkish battleships, five gunboats, one torpedo-boat, eight transports, and no less than 197 {152} supply-ships of all kinds--an amazing record in view of the geographical advantages that had been bestowed upon the defence. Where all were heroes, in the best sense of the word, carrying their lives in their hands on each trip, and where the unsuccessful, in defining the obstacles that baffled them, contributed almost equally to the general results, it is a thankless task, though the only possible one, to select particular units for our purpose. Just as in the Baltic, however, the two outstanding figures were Commander Horton and Captain Cromie, so in the Dardanelles the names that naturally emerge are those of Lieutenant-Commander Holbrook, Lieutenant-Commander Nasmith, and Lieutenant Guy D'Oyly Hughes; and it is to the adventures of these officers, as typical of their service, that we must confine our attention. It was on Sunday, December 13, 1914, that Lieutenant-Commander Norman Holbrook, in the submarine _B11_, first demonstrated to Turkey and the world that the Dardanelles were navigable for British submarines; and, as a pioneer feat, it probably remains unequalled by any individual enterprise of the war. Then about twenty-six, Lieutenant-Commander Holbrook had been in command of the _B11_ for a year, the submarine herself, one of an early type, being part of the Malta Flotilla, and, at the time of this exploit, already eight years old. Her speed above the surface was no more than 13 knots; and, when submerged, she could only travel 9--the mere navigation of the Dardanelles, under such circumstances, being in itself a remarkable achievement. {153}