Just as the Sub boarded the seventh ship the first flung her stern high in the air and disappeared from view. Others were on the point of making their last plunge. It was not a pleasant sight nor a congenial duty, but stern necessity demanded the sacrifice of those seven ships to the exigencies of war; and Fordyce, remembering the fate of many a helpless British merchantman, torpedoed without mercy in the midst of an angry sea and far from land, steeled his heart. Suddenly the coxswain of the whaler gave a warning shout and pointed in the direction of a trail of flame-tinged smoke showing faintly against the warm afterglow. There could be very little doubt concerning the approaching vessel. A German destroyer, too late to save the convoy, was doing her best to avenge its loss. CHAPTER XXX A Duel to the Death Rushing upon the bridge of the foundering vessel, Fordyce looked around for signs of R19. The submarine, giving the sinking craft a wide berth, was slowly forging ahead to stand by to pick up her boat. At the present moment the intercepting hull of the largest tramp hid her from view. "Ahoy!" shouted the Sub the moment R19's bows drew clear. "Enemy destroyer bearing east by south, distance two miles." "Aye, aye," roared Mr. Macquare in reply. "Stand by; we'll pick you up later." Keenly Fordyce watched the visible evolutions of the submarine as, cleared away for diving, she sped through the waves without attempting to submerge. To do otherwise would be running the risk of fouling some of the wreckage from the sunken merchantmen. Stockdale was making sure of his "ground" before seeking cover. Up pelted the German torpedo-craft, the spray flying from her bows and sizzling in clouds of steam against her red-hot funnels. Sighting the submarine just as the latter was gliding beneath the waves, the hostile vessel altered helm and bore down upon the spot where R19 had disappeared, firing ineffectually with every gun that could be brought to bear ahead. To Fordyce it seemed as if the destroyer shuddered under a terrific impact. He was more than half afraid that her sharp stem had sent R19 to her doom. Then came the splash of the mark-buoy being hurled overboard to indicate the supposed position of the submarine, followed by the detonation of a "depth-charge". "Best hook it, sir," suggested Chalmers. "This old tub won't keep afloat much longer." So engrossed was the Sub in the spectacle of the German destroyer searching for her prey that he had entirely overlooked his own peril. Already the tramp's taffrail was level with the water, while her deck betwixt the poop and the rise amidships was flooded. Alongside the entry-port the whaler's crew were "fending off" to prevent the boat being pinned against the side by the inrush of water. "Give way, lads!" ordered Fordyce as he sprang into the waiting boat.