As the crabs came nearer, the Llangaron lowered the great steel cylinder which hung across her stern, until it lay almost entirely under water, and abaft of her rudder and propeller-blades. She now moved slowly through the water, and her men greeted the advancing crabs with yells of defiance, and a shower of shot from machine guns.

The character of the new defence which had been fitted to the Llangaron was known to the Syndicate, and the directors of the two new crabs understood the heavy piece of work which lay before them. But their plans of action had been well considered, and they made straight for the stern of the British ship.

It was, of course, impossible to endeavour to grasp that great cylinder with its rounded ends; their forceps would slip from any portion of its smooth surface on which they should endeavour to lay hold, and no such attempt was made. Keeping near the cylinder, one at each end of it, the two moved slowly after the Llangaron, apparently discouraged.

In a short time, however, it was perceived by those on board the ship that a change had taken place in the appearance of the crabs; the visible portion of their backs was growing larger and larger; they were rising in the water. Their mailed roofs became visible from end to end, and the crowd of observers looking down from the ship were amazed to see what large vessels they were.

Higher and higher the crabs arose, their powerful air-pumps working at their greatest capacity, until their ponderous pincers became visible above the water. Then into the minds of the officers of the Llangaron flashed the true object of this uprising, which to the crew had seemed an intention on the part of the sea- devils to clamber on board.

If the cylinder were left in its present position the crab might seize the chains by which it was suspended, while if it were raised it would cease to be a defence. Notwithstanding this latter contingency, the order was quickly given to raise the cylinder; but before the hoisting engine had been set in motion, Crab Q thrust forward her forceps over the top of the cylinder and held it down. Another thrust, and the iron jaws had grasped one of the two ponderous chains by which the cylinder was suspended.    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.

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.

If the torpedo-boat shot to one side in order to get the crab out of line, the crab, its back sometimes hidden by the tossing waves, sped also to the same side. When the torpedo-boat could aim a gun at the crab and not at the gun-boat, a deadly torpedo flew into the sea; but a tossing sea and a shifting target were unfavourable to the gunner's aim. It was not long, however, before the crab had run the chase which might so readily have been fatal to it, and was so near the gun-boat that no more torpedoes could be fired at it.

Of course the officers and crew of the gun-boat had watched with most anxious interest the chase of the crab. The vessel was one which had been fitted out for service with dynamite guns, of which she carried some of very long range for this class of artillery, and she had been ordered to get astern of the repeller and to do her best to put a few dynamite bombs on board of her.

The dynamite gun-boat therefore had kept ahead at full speed, determined to carry out her instructions if she should be allowed to do so; but her speed was not as great as that of a crab, and when the torpedo- boat had given up the chase, and the dreaded crab was drawing swiftly near, the captain thought it time for bravery to give place to prudence. With the large amount of explosive material of the most tremendous and terrific character which he had on board, it would be the insanity of courage for him to allow his comparatively small vessel to be racked, shaken, and partially shivered by the powerful jaws of the on- coming foe. As he could neither fly nor fight, he hauled down his flag in token of surrender, the first instance of the kind which had occurred in this war.

When the director of Crab Q, through his lookout- glass, beheld this action on the part of the gun-boat, he was a little perplexed as to what he should next do. To accept the surrender of the British vessel, and to assume control of her, it was necessary to communicate with her. The communications of the crabs were made entirely by black-smoke signals, and these the captain of the gun-boat could not understand. The heavy hatches in the mailed roof which could be put in use when the crab was cruising, could not be opened when she was at her fighting depth, and in a tossing sea.

A means was soon devised of communicating with the gun-boat. A speaking-tube was run up through one of the air-pipes of the crab, which pipe was then elevated some distance above the surface. Through this the director hailed the other vessel, and as the air-pipe was near the stern of the crab, and therefore at a distance from the only visible portion of the turtle- back roof, his voice seemed to come out of the depths of the ocean.

The surrender was accepted, and the captain of the gun-boat was ordered to stop his engines and prepare to be towed. When this order had been given, the crab moved round to the bow of the gun-boat, and grasping the cut-water with its forceps, reversed its engines and began to back rapidly toward the British fleet, taking with it the captured vessel as a protection against torpedoes while in transit.

The crab slowed up not far from one of the foremost of the British ships, and coming round to the quarter of the gun-boat, the astonished captain of that vessel was informed, through the speaking-tube, that if he would give his parole to keep out of this fight, he would be allowed to proceed to his anchorage in Portsmouth harbour. The parole was given, and the dynamite gun-boat, after reporting to the flag-ship, steamed away to Portsmouth.

The situation now became one which was unparalleled in the history of naval warfare. On the side of the British, seven war-ships were disabled and drifting slowly to the south-east. For half an hour no advance had been made by the British fleet, for whenever one of the large vessels had steamed ahead, such vessel had become the victim of a crab, and the Vice-Admiral commanding the fleet had signalled not to advance until farther orders.

The crabs were also lying-to, each to the windward of, and not far from, one of the British ships. They had ceased to make any attacks, and were resting quietly under protection of the enemy. This, with the fact that the repeller still lay four miles away, without any apparent intention of taking part in the battle, gave the situation its peculiar character.

The British Vice-Admiral did not intend to remain in this quiescent condition. It was, of course, useless to order forth his ironclads, simply to see them disabled and set adrift. There was another arm of the service which evidently could be used with better effect upon this peculiar foe than could the great battle-ships.

But before doing anything else, he must provide for the safety of those of his vessels which had been rendered helpless by the crabs, and some of which were now drifting dangerously near to each other. Despatches had been sent to Portsmouth for tugs, but it would not do to wait until these arrived, and a sufficient number of ironclads were detailed to tow their injured consorts into port.