The attack was to be conducted by Vice-Admiral Roger Keyes, commanding at Dover. The force employed was a large and composite one which required masterly handling. The Ostend expedition was a comparatively simple affair; but for Zeebrugge there were needed, besides the principal ships, a fleet of smoke-boats for making fog, motor launches for showing flares and bringing off men in difficulties, monitors for bombarding the batteries, and destroyers for looking after the enemy ships lying in harbour, besides a submarine of which we shall hear more presently. The landing on the Mole was to be made from _Vindictive_, an old light cruiser of 5720 tons, and she was to be accompanied by two old Mersey ferry-boats, _Daffodil_ and _Iris_, with storming and demolition parties. The three destroyers were _North Star_ (Lieut.-Commander K. C. Helyar), _Phœbe_ (Lieut.-Commander H. E. Gore-Langton), and _Warwick_, in which the Admiral himself was flying his flag for the occasion. It need not be said, except for the pleasure of saying it, that the name of every officer present is worth remembering. Those who died, gave their lives to secure a victory as effective and gallant as any recorded, even in our naval history. Those who returned are marked men, to whom their country will never look in vain for sound and brilliant service. It is an inspiring thought that while their action was unique, they themselves were not. The British Navy is full of such men, and we may jostle them in the corridors of the Admiralty every day in the year. Anyone who happened to be near Room 24 on the morning of Monday, April 22, might have seen two officers come out who bore no sign of a destiny more heroic than the rest. Yet they were, in fact, Captain Alfred Carpenter, who had been selected to command _Vindictive_, and Wing-Commander Brock, who was to create the magic fog, and whose mysterious fate is one of the most heroic and moving episodes of the fight.