The davits from which the cylinder hung were thick and strong, and the iron windlasses to which the chains were attached were large and ponderous; but these were not strong enough to withstand the weight of two crabs with steel-armoured roofs, enormous engines, and iron hull. In less than a minute one davit snapped like a pipe-stem under the tremendous strain, and immediately afterward the windlass to which the chain was attached was torn from its bolts, and went crashing overboard, tearing away a portion of the stern-rail in its descent. Crab Q instantly released the chain it had held, and in a moment the great cylinder hung almost perpendicularly from one chain. But only for a moment. The nippers of Crab R still firmly held the chain, and the tremendous leverage exerted by the falling of one end of the cylinder wrenched it from the rigidly held end of its chain, and, in a flash, the enormous stern-guard of the Llangaron sunk, end foremost, to the bottom of the channel. In ten minutes afterward, the Llangaron, rudderless, and with the blades of her propellers shivered and crushed, was slowly turning her starboard to the wind and the sea, and beginning to roll like a log of eight thousand tons. Besides the Llangaron, three ironclads were now drifting broadside to the sea. But there was no time to succour disabled vessels, for the rest of the fleet was coming on, and there was great work for the crabs. Against these enemies, swift of motion and sudden in action, the torpedo-boats found it almost impossible to operate, for the British ships and the crabs were so rapidly nearing each other that a torpedo sent out against an enemy was more than likely to run against the hull of a friend. Each crab sped at the top of its speed for a ship, not only to attack, but also to protect itself. Once only did the crabs give the torpedo-boats a chance. A mile or two north of the scene of action, a large cruiser was making her way rapidly toward the repeller, which was still lying almost motionless, four miles to the westward. As it was highly probable that this vessel carried dynamite guns, Crab Q, which was the fastest of her class, was signalled to go after her. She had scarcely begun her course across the open space of sea before a torpedo-boat was in pursuit. Fast as was the latter, the crab was faster, and quite as easily managed. She was in a position of great danger, and her only safety lay in keeping herself on a line between the torpedo-boat and the gun-boat, and to shorten as quickly as possible the distance between herself and that vessel.