commanders of not less than a dozen mine-sweeping craft. What struck Dave as the most prominent feature of these small, unpretentious craft was the slow, systematic way in which they performed their duty.

"It's a wonderful work," Dave explained to Fernald. "If it were not for these dingy, stub-nosed little craft, and the fine spirit of their crews, hundreds of steamships would probably be blown up in these waters in a month. The Hun sneaks through these waters, laying mines, mostly from submarines built for the purpose, and these patient mine-sweeper commanders go along after them, removing most of the mines from the paths of navigation."

Having cruised as far north as his instructions directed him to do, Darrin ordered the "Grigsby" and the "Reed" to turn about and nose their way back under bare headway.

Every mine-sweeper carried a radio outfit for sending messages. Each craft was also supplied with the mast-head "blinkers" for flashing night signals. When the craft signalled to, however, was near enough, colored lights operated from the deck were used instead, that the messages might not be sent far enough into the night to be picked up by skulking enemy craft.

"It looks like a night of tame sport, sir," said Fernald, just before he went below for a nap.

"It has been quiet so far," Darrin agreed. "But the most striking thing in naval service is that whatever starts comes without warning. We might have a whole week as quiet as to-night has been, and then run into twenty-four hours of work that would give both of us gray hair."

An hour after Fernald went below Dave had a steamer chair brought to the bridge, also a rug. The chair was placed where a canvas wind-shield would protect the sitter from the keen edge of the wind.

"I'm going to doze right here, Mr. Ormsby," Dave explained to the ensign who was on bridge watch. "I'm to be called the instant anything turns up."

Accustomed to such sleeps Darrin had barely closed his eyes when he was off in the Land o' Nod. Some time afterwards the sharp orders of Ensign Andrews, new officer of the bridge watch, caused Darrin to open his eyes, cast aside the rug and spring to his feet all in the same instant.

"Torpedo coming on our starboard bow, sir," reported Mr. Andrews, turning and finding his chief at his post.

At that instant the "Grigsby" gave a sharp turn to port and sprang ahead under quickened speed.

Bump! Swift as the discovery had been made, quickly as the saving orders had been given, the oncoming torpedo bumped the hull of the "Grigsby" with a crash audible to those within a hundred feet of the point of impact. But it did not strike full on, the contact being only glancing, like that of a boat going alongside a landing stage. The watchers from the bridge saw the torpedo's wake as the deflected projectile continued on its harmless way.

"We couldn't have had a much narrower squeak than that!" Dave ejaculated. "Andrews, I congratulate you."

"I'm naturally interested in saving the ship, sir, and my own skin as well," replied Ensign Andrews with a grin.

Dave, not having taken his eyes from the faint streak on the water, called for highest speed and a complete turn. Then, ordering the rays of the searchlight to play over the water, Darrin sent the "Grigsby" racing, bow-on, toward the spot from which he judged the torpedo to have been launched. In the meantime Dalzell's "Reed" had turned her prow in the same general direction, steaming slowly after the "Grigsby."

"The Hun can't be located," Dave confessed, a few minutes later. "That chap is like most of the other Hun submarine commanders. He'll launch a torpedo by stealth, but as soon as he knows the destroyer is after him he hunts depth and runs away."

Dave's next order was to send a wireless message, warning all mine-sweepers and other craft that an enemy submarine had been discovered in that location.

Though no word had been passed for Lieutenant Fernald, that executive officer, awakened by the bump and the abrupt change in the destroyer's course, hurried to the bridge.

"Did you get a good rest, Fernald?" Dave queried, half an hour later.

"Fine, sir."

"Then I am going to the chart-room to rest for a while. I got chilled dozing in that chair. Set the bell going in the chart-room if I'm wanted."

Then Dave slept on, without call, for a few hours, well knowing that Lieutenant Fernald could well fill his place. The first signs of dawn awakened Darrin. He sprang up, reaching for the bridge telephone.

"All secure, sir," reported Fernald, from the bridge.

Dave therefore delayed long enough to make his toilet—a none too frequent luxury aboard a destroyer in the danger zone. Then, fully refreshed and ruddy, Darrin drew on his tunic and over that his sheepskin coat. Placing his uniform cap on his head he stepped out on deck before the sun had begun to rise up above the sea.

In the distance, in three different directions, as many British mine-sweepers could be seen patiently combing the seas for mines.

"What number recovered?" Dave signalled.

"Three," replied one craft. "Five," said another. "One," came from the third sweeper.

"Nine in all," Dave remarked to Fernald. "We're in a mine field, then. We shall need to be vigilant."

The sun soon rose, strong and brilliant, only to pass behind a bank of clouds and leave the air damp and chilly. An hour later a fog settled over the English Channel, soon becoming so dense that one could not see beyond about three hundred yards.

Dave went below to a hurried breakfast. Returning, he sent Lieutenant Fernald to his meal and rest.

"I'll remain on the bridge all day, unless this fog lifts," Darrin decided. He increased the number of lookouts and ordered slow speed, so that the long, narrow destroyer, capable of racing rapidly over the waves, now merely crept along.

When the watch was changed Dave barely returned the salutes of the departing and oncoming watch officers, for his whole attention was centered on the sea. Half an hour after that he started slightly, then stared hard.

Off the starboard bow he thought he made out something moving as slowly as the "Grigsby" herself was proceeding.

"Pick that up, Mr. Ormsby, and see if it's anything more than a dream," ordered Dave, pointing.

Instantly the course of the destroyer was changed several points to starboard and speed increased a trifle.

Through the haze there soon developed the outlines of a steam craft, set low in the water, and of not more than two thousand tons. She was not a handsome craft, but, on the contrary, appeared ghostlike as she stood only half-revealed through the fog.

Undoubtedly the stranger had a lookout up forward, but no sign of one could be made out as the "Grigsby" gained on her.

Her markings indicated that she belonged to one of the neutral countries to the northward. The wet flag that she flew drooped so tightly around the staff that nothing could be learned from that bit of bunting.

"One of the neutral traders," remarked Ensign Ormsby.

"She must give an account of herself," Dave answered. "Whatever she is, or carries, she doesn't look like a craft to be entrusted with a valuable cargo."

As the "Grigsby" ranged up alongside, an officer stepped out from the stranger's wheelhouse and came to the rail.

"What craft is that?" Dave demanded.

The skipper, if such he was, replied in broken English, naming a neutral country, and adding that the vessel was the "Olga," bound for an English port with a cargo of wood pulp.

"I knew