"Then she must be going up the gutter, because there's not a fathom on the banks. We'll go ahead; there's enough water anywhere for us."

The launch swung round on a different course when her engines began to clank, and a man sounded now and then as they ran for the shoals. The lieutenant hardly expected to follow the channel; his object was to keep within hearing of the other vessel, and, if he were lucky, his work would be finished before the tide ebbed much. Suddenly a sharp, pulsatory roar came out of the dark.

"It looks as if she were on the ground and carrying plenty steam," he said, when he had ordered the engines to be stopped. "As they'll no doubt back her off, we'll wait a while, to give them time to ship their cargo."

For the next few minutes the crews of launch and gig listened eagerly.

They knew that when the vessel ran aground the steam her stopped engines could not use had blown off. The roar died away, as was to be expected, when the machinery was restarted, hard-astern, but now that the immobility of the stranded craft increased the resistance, the thud of the screw was louder. Presently, it changed to a steady beat that drew away from them; and they knew she had got afloat and was steaming up-channel.

"Easy all, for half an hour!" said the lieutenant, looking at his watch.

The boats lay close together, rolling gently on the languid swell, while the men sat in relaxed att.i.tudes and talked in low voices.

Still, there was a feeling of suppressed excitement and it was a relief when their officer grasped the wheel.

"Let her go at half speed!" he ordered.

The tow-rope tightened as the gig swung into line astern, and they moved steadily toward the land for some time. Then they heard a roar of steam again, louder than before and continuous, and the lieutenant signed to the engineer.

"Full speed! We have her now!"

The water hissed along the planks, the gig lifted her bows on a surging wave, and the wash of the screw ran far astern. A blurred object grew out of the darkness in front of them, and then the officer called to the coastguards:

"Cast off and get to your work! Burn a flare if you want us!"

A rope fell into the water, the engines stopped, and there was a rattle of oars as the gig drove by. They fell with a simultaneous splash, and their regular thud receded as she swept up-channel while the launch's crew waited.

In a few minutes the sound stopped. There were alarmed shouts and hoa.r.s.e orders; while the roar of steam continued. Then the beat of oars began again. The boat came back slowly, with two men pulling, and ran alongside the launch.

"You don't seem to have had much trouble," the lieutenant remarked.

"We hadn't, sir," answered a coastguard officer. "They were busy and didn't hear us until we'd got our boat-hook on her rail. Only one of them drew a pistol and he was knocked down. We'll land them and leave a guard on board when she's moored.'"

"Very well, if we can't take her to Barrow this tide?"

The coastguard laughed.

"So far as I could see, there's a big piece of flounder-net wrapped round her propeller and trailing about her aft. It has an unusually thick head-rope, and some lengths of iron pipe are jambed between the blades and the rudder. The fellow who set the net made a good job.

We'll have trouble in cutting it loose when she dries."

"Did you find much oil?"

"About a boat-load of heavy drums, which had just been thrown on deck.

We got the boat and I guess our fellows ash.o.r.e have seized another lot. However, here are your two men. I don't think you'll do much with the skipper, but the other seems less obstinate."

Two handcuffed men were put on board and the boat dropped back as the launch leaped ahead. The water rose about her bows in a white, curling wave, her stern sank down in a hollow ridged with foam, and she shook with the fierce throb of hard-driven machinery. Dark hills slid past to starboard, bold cliffs that stood out from their dim background rolled by, and after a time a flash from a lantern was answered by a gleam of light ahead. Then the blurred outline of a steamer grew into distinct form. In another minute the launch was alongside and the winches strained and clanked as she was hoisted in.

"Everything went as we expected, and I've brought you the two prisoners," the lieutenant reported to Rankine, who sat in his room before a big chart.

"Send them in, one at a time. And clear the guns and get under way.

The course is west by south."

Rankine spent some time examining his prisoners. One preserved an obstinate silence, but when he had been taken away, the other seemed to see the force of Rankine's arguments. When the second prisoner had been dismissed, Rankine went up to the bridge and changed the course a few points.

"The fellow bears out what we have been told," he said to the young officer on watch. "I rather think he'll deal straight with us in order to save his skin. Anyhow, he has given me their supply-boat signal.

The craft we're after is the latest and biggest thing of her kind."

"We ought to bag her," the officer replied thoughtfully. "I've got the searchlight rigged, and Wilson's the best shot we had on the battleship. Still, the little guns are awkwardly mounted and we haven't a clear field of fire."

"It won't need more than one shot. A perforated submarine isn't much use under water, and the game's ours if she stays on top. I'll give you the call-up signal and you can get things ready."

An hour later, Rankine pressed a b.u.t.ton and the engines stopped. The clang of a steamer's bridge-telegraph can be heard some distance off, but Rankine had subst.i.tuted an electric signal. Having undertaken a dangerous piece of work, he had carefully made his plans so that he need not announce his movements to the enemy. Two guns had been put on board the vessel, but as it was thought advisable to conceal them, and the deckhouse and the masts were in the way, their fire commanded only a limited strip of horizon.

Rankine searched the water with his night-gla.s.ses.

The coast was out of sight, mist drifted across the sea, and the night was dark. On the whole, this was an advantage, for his antagonist was expecting a trawler, and the darkness would prevent him from noticing the vessel's size and rig until they were close together. There was some swell, though the surface of the water was smooth, and the vessel rolled languidly. A feather of steam eddied about her funnel, and there was a soft splashing as her slanted side sank into the sea. No gleam of light pierced the darkness; everything was still; and Rankine stood waiting eagerly.

Presently he gave an order and one of the prisoners was brought to the bridge; then the steamer slowly moved ahead while a petty officer, standing behind a canvas wind-screen, alternately held up and lowered red and green pyrotechnic flares. The streams of colored light showed shadowy figures waiting motionless at their stations and drove a radiant track across the water. Then they died away and men whose eyes had been held by the glitter felt relief. Now they could see about the ship, and they knew watchfulness was needed.

For five minutes nothing happened, and Rankine, conscious of keen tension, began to wonder whether he should signal again. It was possible that he had overshot or fallen short of his distance. Then a sharp hail came from a lookout and he saw the sea break not far ahead.

A confused white ripple spread away from something that moved amidst it, and drew out in a long, wavering line. A lantern flashed between regular intervals of darkness, and presently a low, black object grew out of the advancing foam. Rankine pressed the b.u.t.ton and the throb of engines slackened; then he gave an order to his prisoner.

The man hailed in German; the submarine swerved and slowed; and the two vessels drew abreast, perhaps fifty yards apart, while Rankine's quarter boat swung out from the davits.

"Tell them to jump into the water and I'll pick them up!" he ordered the prisoner.

As the man called out, a dazzling beam from the searchlight played upon the submarine's hull and her wet steel skin glittered like silver. The next moment there was another flash, streaked with a vein of red; and a cloud of thin, acrid smoke whirled up. The steamer quivered with the heavy concussion; the submarine reeled and listed over. Indistinct figures plunged into the foam that lapped about her side; and then the bright beam showed an empty stretch of seething water: Rankine was watching his boat, which moved into the lighted track on her work of rescue, when a lookout shouted a hoa.r.s.e warning.

Swinging round, Rankine saw a feathery streak of foam on the opposite side of the vessel. It was heading toward her at tremendous speed, and he knew the wash of a torpedo.

"Starboard, hard!" he called to the helmsman; and set his lips as he pressed the b.u.t.ton for full speed.

Two submarines had answered his signal, instead of one, and the last had crept up to attack him while he was sinking her consort.

The steamer, however, answered her helm, slowly, but enough. The swift white streak drove past her stern with a few feet to spare, and she began to shake as her engines quickened.

"Port!" Rankine shouted in a harsh voice. "Steady that!"

A flash blazed out of the darkness, a panel of the wheelhouse was shattered, and the canvas bridge-screen fell apart in rags; but Rankine had seen a long, dark shape on the water close ahead. It might vanish in a moment, before his guns could be swung and trained.

Indeed, he doubted if the submarine were within their field of fire, and he meant to use a surer means. One end of the black hull tilted up and the other began to sink. His enemy was going under. But would she be quick enough? The steamer's sharp steel stem was only a dozen yards away now.

Shouting an order to the crew, Rankine gripped the bridge-rails hard.

The water ahead boiled and rose in a tumbling ridge; there was a heavy shock, and the steamer trembled violently. One could feel her forge through something that crumpled up beneath her bows; but the jarring and grinding pa.s.sed aft, and she leaped forward when she was once over the obstacle. Rankine saw a curious disturbance down the screw-torn wake, but it subsided and he stopped the engines.

"Sound the forward well! Swing your light aft and lower the gig!" he ordered.

The stream of radiance flashed astern and spread about the vessel; but there was nothing on the water except their own boat, which made toward them. Then a man came up to report that the well was nearly dry.

"She's a strong old ship," Rankine remarked, and turned to another man: "Where's that prisoner, Evans?"