"Which proves, or doesn't prove, that the 'Olga' sowed the mines," Dave declared. "That remains for the court-martial to decide. But the three mines just swept up will be interesting evidence for the court to consider."

Learning that the commander of the mine-sweeper would be glad to furnish some members for a prize crew, and to convoy the prize into port, Dave decided to leave Ensign Burton aboard with only three men from the "Grigsby," filling out the prize crew with English sailors. This was accordingly done. Dave's own ship was then signalled and located by whistle, and the launch started on its return.

"Keep that captured crew under strict guard. Don't give them any chance to recapture their vessel!" was Dave's last warning to Ensign Burton.

The "Olga" quickly faded away in the fog and then the "Grigsby" was picked up and boarded.

"Great work, sir, I'd call it!" declared Lieutenant Fernald, when he heard the details of what had taken place.

"The scoundrel, to sail as a neutral, and do such dirty work for the Huns for mere pay!" uttered Dave, indignantly. "Fernald, do you know that there were moments when I had to restrain myself to keep from kicking that scoundrel about his own deck?"

"I can understand the temptation," nodded the executive officer.

"On second thought, though," Darrin continued, "the skipper is certainly being much worse punished by the suspense of mind in which his present plight places him. He knows that, if convicted, the finding of the court will be 'piracy,' and he knows the punishment for that crime."

"It used to be hanging," nodded Fernald. "It seems almost a pity that this war has introduced the swifter and more merciful punishment of death by shooting."

"And as he looks around at his crew he knows that they must face the same fate with him, and he knows, too, that they know that he has brought the penalty upon them."

"But is it possible that the crew were ignorant, or most of them ignorant, of what he was doing in addition to really carrying wood pulp cargoes?" asked Fernald.

"That will be another question for the court-martial to decide," Darrin answered. "It doesn't seem possible that any member of the crew could really be in ignorance of the mine-laying work."

A long blast from either the invisible "Olga" or the equally invisible mine-sweeper now announced that the prize was proceeding on her way. The "Grigsby" did not answer, for on a sea infested by hidden enemies it was not wise to use too many whistle signals.

The "Grigsby" now returned to her course and former speed, and again started on her way. Barely ten minutes had pa.s.sed when from a bow lookout came the sharp hail:

"'Ware submarine, dead ahead, sir!"

Sharp eyes, indeed, that had made out the presence of the enemy craft by sighting the slender, almost pencil-like periscope that projected some few feet above the water.

At the instant it was discovered the periscope sank down below the surface.

CHAPTER III

A FIGHT OF THE GOOD OLD KIND

FULL speed ahead! Then ahead she leaped. Ere the destroyer had gained full momentum her bow struck something under the water. Men were thrown from their feet by force of the shock, and the destroyer lurched heavily.

"Hope we haven't torn our bottom out," muttered Darrin as he joined the bow lookouts.

On the water appeared a patch of oil which rapidly broadened. A wooden stool and other floating objects were visible.

"That looks like a fair score," declared the young lieutenant-commander, at which the on-looking seamen grinned broadly.

Over the spot the destroyer again steamed, but nothing pa.s.sing under her keel was noticed. The sea was clear before her.

It was hours later when Darrin received, in a special code of the British Admiralty, word that the "Olga" and her convoy had reached port, and the "Olga's" officers and crew had been turned over to the Admiralty officials.

In the meantime Dan Dalzell and the "Reed," as learned by occasional wireless messages, had been separated at no time by more than two miles, though neither craft was visible from the other.

Towards the end of the afternoon the fog began to lift. By nightfall it had disappeared. The stars came out and the crescent moon hung near the western horizon. Both destroyers had again turned north, the two craft having drawn in within half a mile of each other.

Dave, after a two-hour nap, went to the bridge at about two bells--nine o'clock. He had been there some ten minutes, chatting with Ensign Ormsby in low tones, when of a sudden he broke off, listening intently.

"Sounds like distant firing, sir, two points off the port bow," hailed one of the bow lookouts.

In a silence, broken only by the wash of the waters and the jar of the engines, distant rumbling sounds were again heard.

"That's gun-fire," Dave declared. "Mr. Ormsby, have the signals shown so that word may be conveyed to the 'Reed' to keep with us at full speed."

In another moment both destroyers dashed forward with a great roaring of machinery and dense clouds of smoke trailing behind from the four stacks of each.

When some miles had been covered, with the gun-fire sounding with much greater distinctness, Darrin felt that he could judge the distance properly. Turning on a screened light he consulted the chart.

"It's just about there," Darrin declared, placing his finger on a spot on the map. "Ormsby, I believe that enemy craft are bombarding the little fishing village of Helston. It's an unfortified, small port."

"That's the kind the Huns would prefer," returned the ensign, with a savage smile.

"Ask the chief engineer if a bit more speed is obtainable; then sound the bell in Mr. Fernald's cabin."

A knot an hour more was soon forced from the "Grigsby's" engines, though at that racing gait it would have been difficult for an amateur observer to have detected the fact that speed had been gained. The "Reed," too, leaped forward.

Minute after minute of breathless racing followed. Presently the flashes of guns could be made out ahead against the darkness of the night.

Helston showed no lights, but the sound of bursting sh.e.l.ls located the fishing village to those on the bridges of the approaching destroyers.

"The hounds!" blazed Dave, indignantly. "Up to their old and favorite game of killing defenseless people!"

Long ago the crew had been called to quarters. Everything was in readiness to attack the enemy.

"Three of them, and all destroyers, judging by the size of the flash of their guns," Darrin judged.

Throughout the war it has been a favorite trick of the enemy, when the opportunity offered, to send these swift craft out on night attacks. No other craft on the seas, except Entente destroyers, are capable of pursuing and overtaking German destroyers when they flee.

"Open fire when we do," was the signal flashed to the "Reed."

"We're ready," came back the instant answer.

Two minutes later one of Darrin's forward guns flashed out into the night. From the "Reed" there came a similar flash.

"Let 'em have it, fast and hard!" ordered Dave.

As the two destroyers sprang forward, firing at full capacity, the three German craft turned and steamed toward them.