The other end of the cylinder began to rise, but at this moment Crab R, apparently by a single effort, lifted herself a foot higher out of the sea; her pincers flashed forward, and the other chain was grasped.

The two crabs were now placed in the most extraordinary position. The overhang of their roofs prevented an attack on their hulls by the Llangaron, but their unmailed hulls were so greatly exposed that a few shot from another ship could easily have destroyed them. But as any ship firing at them would be very likely to hit the Llangaron, their directors felt safe on this point.

Three of the foremost ironclads, less than two miles away, were heading directly for them, and their rams might be used with but little danger to the Llangaron; but, on the other hand, three swift crabs were heading directly for these ironclads.

It was impossible for Crabs Q and R to operate in the usual way. Their massive forceps, lying flat against the top of the cylinder, could not be twisted. The enormous chains they held could not be severed by the greatest pressure, and if both crabs backed at once they would probably do no more than tow the Llangaron stern foremost. There was, moreover, no time to waste in experiments, for other rams would be coming on, and there were not crabs enough to attend to them all.

No time was wasted. Q signalled to R, and R back again, and instantly the two crabs, each still grasping a chain of the cylinder, began to sink. On board the Llangaron an order was shouted to let out the cylinder chains; but as these chains had only been made long enough to allow the top of the cylinder to hang at or a little below the surface of the water, a foot or two of length was all that could be gained.

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.