This was considered an adequate defence against the nippers of a Syndicate crab; but as a means of offence against these almost submerged vessels a novel contrivance had been adopted. From a great boom projecting over the stern, a large ship's cannon was suspended perpendicularly, muzzle downward. This gun could be swung around to the deck, hoisted into a horizontal position, loaded with a heavy charge, a wooden plug keeping the load in position when the gun hung perpendicularly.

If the crab should come under the stern, this cannon could be fired directly downward upon her back, and it was not believed that any vessel of the kind could stand many such tremendous shocks. It was not known exactly how ventilation was supplied to the submarine vessels of the Syndicate, nor how the occupants were enabled to make the necessary observations during action. When under way the crabs sailed somewhat elevated above the water, but when engaged with an enemy only a small portion of their covering armour could be seen.

It was surmised that under and between some of the scales of this armour there was some arrangement of thick glasses, through which the necessary observation could be made; and it was believed that, even if the heavy perpendicular shots did not crush in the roof of a crab, these glasses would be shattered by concussion. Although this might appear a matter of slight importance, it was thought among naval officers it would necessitate the withdrawal of a crab from action.

In consequence of the idea that the crabs were vulnerable between their overlapping plates, some of the Adamant's boats were fitted out with Gatling and machine guns, by which a shower of balls might be sent under the scales, through the glasses, and into the body of the crab. In addition to their guns, these boats would be supplied with other means of attack upon the crab.

Of course it would be impossible to destroy these submerged enemies by means of dynamite or torpedoes; for with two vessels in close proximity, the explosion of a torpedo would be as dangerous to the hull of one as to the other. The British Admiralty would not allow even the Adamant to explode torpedoes or dynamite under her own stern.

With regard to a repeller, or spring-armoured vessel, the Adamant would rely upon her exceptionally powerful armament, and upon her great weight and speed. She was fitted with twin screws and engines of the highest power, and it was believed that she would be able to overhaul, ram, and crush the largest vessel armoured or unarmoured which the Syndicate would be able to bring against her. Some of her guns were of immense calibre, firing shot weighing nearly two thousand pounds, and requiring half a ton of powder for each charge. Besides these she carried an unusually large number of large cannon and two dynamite guns. She was so heavily plated and armoured as to be proof against any known artillery in the world.

She was a floating fortress, with men enough to make up the population of a town, and with stores, ammunition, and coal sufficient to last for a long term of active service. Such was the mighty English battle- ship which had come forward to raise the siege of the Canadian port.

The officers of the Syndicate were well aware of the character of the Adamant, her armament and her defences, and had been informed by cable of her time of sailing and probable destination. They sent out Repeller No. 7, with Crabs J and K, to meet her off the Banks of Newfoundland.

This repeller was the largest and strongest vessel that the Syndicate had ready for service. In addition to the spring armour with which these vessels were supplied, this one was furnished with a second coat of armour outside the first, the elastic steel ribs of which ran longitudinally and at right angles to those of the inner set. Both coats were furnished with a great number of improved air-buffers, and the arrangement of spring armour extended five or six feet beyond the massive steel plates with which the vessel was originally armoured. She carried one motor-cannon of large size.

One of the crabs was of the ordinary pattern, but Crab K was furnished with a spring armour above the heavy plates of her roof. This had been placed upon her after the news had been received by the Syndicate that the Adamant would carry a perpendicular cannon over her stern, but there had not been time enough to fit out another crab in the same way.

When the director in charge of Repeller No. 7 first caught sight of the Adamant, and scanned through his glass the vast proportions of the mighty ship which was rapidly steaming towards the coast, he felt that a responsibility rested upon him heavier than any which had yet been borne by an officer of the Syndicate; but he did not hesitate in the duty which he had been sent to perform, and immediately ordered the two crabs to advance to meet the Adamant, and to proceed to action according to the instructions which they had previously received. His own ship was kept, in pursuance of orders, several miles distant from the British ship.

As soon as the repeller had been sighted from the Adamant, a strict lookout had been kept for the approach of crabs; and when the small exposed portions of the backs of two of these were perceived glistening in the sunlight, the speed of the great ship slackened. The ability of the Syndicate's submerged vessels to move suddenly and quickly in any direction had been clearly demonstrated, and although a great ironclad with a ram could run down and sink a crab without feeling the concussion, it was known that it would be perfectly easy for the smaller craft to keep out of the way of its bulky antagonist. Therefore the Adamant did not try to ram the crabs, nor to get away from them. Her commander intended, if possible, to run down one or both of them; but he did not propose to do this in the usual way.

As the crabs approached, the stern-jacket of the Adamant was let down, and the engines were slowed. This stern-jacket, when protecting the rudder and propellers, looked very much like the cowcatcher of a locomotive, and was capable of being put to a somewhat similar use. It was the intention of the captain of the Adamant, should the crabs attempt to attach themselves to his stern, to suddenly put on all steam, reverse his engines, and back upon them, the stern-jacket answering as a ram.

The commander of the Adamant had no doubt that in this way he could run into a crab, roll it over in the water, and when it was lying bottom upward, like a floating cask, he could move his ship to a distance, and make a target of it. So desirous was this brave and somewhat facetious captain to try his new plan upon a crab, that he forebore to fire upon the two vessels of that class which were approaching him. Some of his guns were so mounted that their muzzles could be greatly depressed, and aimed at an object in the water not far from the ship. But these were not discharged, and, indeed, the crabs, which were new ones of unusual swiftness, were alongside the Adamant in an incredibly short time, and out of the range of these guns.

Crab J was on the starboard side of the Adamant, Crab K was on the port side, and, simultaneously, the two laid hold of her. But they were not directly astern of the great vessel. Each had its nippers fastened to one side of the stern-jacket, near the hinge-like bolts which held it to the vessel, and on which it was raised and lowered.

In a moment the Adamant began to steam backward; but the only effect of this motion, which soon became rapid, was to swing the crabs around against her sides, and carry them with her. As the vessels were thus moving the great pincers of the crabs were twisted with tremendous force, the stern-jacket on one side was broken from its bolt, and on the other the bolt itself was drawn out of the side of the vessel. The nippers then opened, and the stern-jacket fell from their grasp into the sea, snapping in its fall the chain by which it had been raised and lowered.

This disaster occurred so quickly that few persons on board the Adamant knew what had happened. But the captain, who had seen everything, gave instant orders to go ahead at full speed. The first thing to be done was to get at a distance from those crabs, keep well away from them, and pound them to pieces with his heavy guns.

But the iron screw-propellers had scarcely begun to move in the opposite direction, before the two crabs, each now lying at right angles with the length of the ship, but neither of them directly astern of her, made a dash with open nippers, and Crab J fastened upon one propeller, while Crab K laid hold of the other. There was a din and crash of breaking metal, two shocks which were felt throughout the vessel, and the shattered and crushed blades of the propellers of the great battle- ship were powerless to move her.

The captain of the Adamant, pallid with fury, stood upon the poop. In a moment the crabs would be at his rudder! The great gun, double-shotted and ready to fire, was hanging from its boom over the stern. Crab K, whose roof had the additional protection of spring armour, now moved round so as to be directly astern of the Adamant. Before she could reach the rudder, her forward part came under the suspended cannon, and two massive steel shot were driven down upon her with a force sufficient to send them through masses of solid rock; but from the surface of elastic steel springs and air-buffers they bounced upward, one of them almost falling on the deck of the Adamant.

The gunners of this piece had been well trained. In a moment the boom was swung around, the cannon reloaded, and when Crab K fixed her nippers on the rudder of the Adamant, two more shot came down upon her. As in the first instance she dipped and rolled, but the ribs of her uninjured armour had scarcely sprung back into their places, before her nippers turned, and the rudder of the Adamant was broken in two, and the upper portion dragged from its fastenings then a quick backward jerk snapped its chains, and it was dropped into the sea.

A signal was now sent from Crab J to Repeller No. 7, to the effect that the Adamant had been rendered incapable of steaming or sailing, and that she lay subject to order.

Subject to order or not, the Adamant did not lie passive. Every gun on board which could be sufficiently depressed, was made ready to fire upon the crabs should they attempt to get away. Four large boats, furnished with machine guns, grapnels, and with various appliances which might be brought into use on a steel-plated roof, were lowered from their davits, and immediately began firing upon the exposed portions of the crabs. Their machine guns were loaded with small shells, and if these penetrated under the horizontal plates of a crab, and through the heavy glass which was supposed to be in these interstices, the crew of the submerged craft would be soon destroyed.

The quick eye of the captain of the Adamant had observed through his glass, while the crabs were still at a considerable distance, their protruding air-pipes, and he had instructed the officers in charge of the boats to make an especial attack upon these. If the air-pipes of a crab could be rendered useless, the crew must inevitably be smothered.

But the brave captain did not know that the condensed-air chambers of the crabs would supply their inmates for an hour or more without recourse to the outer air, and that the air-pipes, furnished with valves at the top, were always withdrawn under water during action with an enemy. Nor did he know that the glass blocks under the armour-plates of the crabs, which were placed in rubber frames to protect them from concussion above, were also guarded by steel netting from injury by small balls.