The officer started to protest, but at the sight of Jack's revolver, leveled right at his head, he reconsidered and did as ordered. Jack now motioned Frank to stand guard over the Austrian commander, and himself took the wheel.

Slowly the Austrian cruiser, her head describing a wide circle, gathered speed and turned in the direction of the allied fleet.

Evidently those below had no idea that anything was wrong, for not a sound reached the ears of those on deck.

Now, at Jack's command, the commander signaled the engine-room for full speed ahead, and the pace of the cruiser increased.

Swiftly she dashed along in the night, but was suddenly checked in her flight by a hail from across the water:

"What ship is that?"

Jack recognized the voice of Captain Dreyfuss, and called back:

"Captured Austrian cruiser, sir. This is Templeton. What shall I do with her?"

"Take her on to the fleet," came the reply.

"Good work! I shall not wait for you to return but will continue immediately."

This was a disappointment to the two lads, who had banked on being aboard the Marie Theresa in her raid. However, orders were not to be disobeyed.

Day was breaking when the Austrian cruiser steamed in among the French ships. Jack went aboard the admiral's flagship and reported. It was while he was standing beside the admiral that a fearful commotion broke out on board the captured Austrian cruiser.

There was the sound of a big gun, and a sh.e.l.l screamed overhead.

"The fools!" exclaimed the admiral. "Can't they understand they have been captured?"

Evidently the Austrians could not, for a second sh.e.l.l screamed overhead.

Quickly the flagship signaled the French aboard the captured vessel to leave, and when they were over the side and well out of harm's way the French dreadnought opened fire on the cruiser.

Men now emerged from below on to the deck of the captured vessel, and rushed rapidly about.

An officer leveled a gla.s.s and took in the imposing sight of the French gathered about on all sides of him.

In another moment a white flag was run up at the masthead. It was the sign of surrender.

The French admiral complimented both lads highly on the success of their venture; and congratulated them again personally that night, when the Marie Theresa, after a successful raid into the very midst of the Austrian fleet, returned unscathed--leaving at the bottom of the sea two Austrian torpedo boats.

CHAPTER XVIII

THE BATTLE IN THE ADRIATIC

The French and Austrian fleets were steaming into battle in the Adriatic. This coming struggle, while it was to be by no means decisive, was nevertheless the first engagement of any magnitude to be fought in southern waters; also it was the first in which fighters of the air were to play an important part.

The Marie Tieresa, back from her successful raid, was one of the foremost in the French line of battle. Now, as she steamed forward with the rest of the fleet, her hydroplanes were made ready for action.

Captain Dreyfuss summoned Jack and Frank before him.

"You will each take a seat in one of the hydroplanes," he ordered. "Your duties will be to drop bombs on the enemy. Each machine carries two men, one a pilot. Therefore you will each take separate machines."

Frank and Jack saluted, and a moment later were in their places.

What was Jack's surprise to find that the pilot of his machine was none other than the French midshipman he had so lately engaged in fistic combat. The latter, whom the boys had learned to call Pierre, greeted him with a smile.

"I'm glad I am to have you along," he said simply.

"Thanks," was Jack's brief reply.

The French hydroplanes, at least fifty of them, from all the battleships, now skimmed over the water, and a moment later soared in the air. Flying on beyond the French ships, a smudge of smoke came into view, then another, and then many more. Ships of all kinds, Jack could see, dreadnoughts, cruisers, torpedo boats and scout ships, advancing toward them.

Then, as they drew nearer, Jack made out other vessels, lying low in the water, without smoke, approaching. These were the Austrian submarines. Jack counted the enemy--sixteen ships of all cla.s.ses, and opposed to these the French had offered almost an equal number. The forces of both sides under and above the sea, of course, he could not count.

Some of the airships from both sides now came into contact, and brisk skirmishes ensued. Rifles flashed from them, and suddenly one tumbled into the sea. It was an Austrian craft, and it was first blood for the French.

Now the aircraft, at a signal, returned to their respective fleets, and hovered over them. The speed of both squadrons was reduced together. The submarines of both fleets suddenly sank from sight, and it was evident to Jack that the first blows probably would be struck from under water.

The aircraft once more advanced, flying low, seeking to learn the positions of the submarines, and to point them out to the gunners on the big battleships and cruisers. A periscope, extending a few feet above water, gave Jack a good target, and the lad dropped a bomb.

There was a terrific explosion below the water. The periscope disappeared. There was one Austrian submarine less.

The two squadrons of ships meantime were drawing nearer together.

The first French battleship, flagship of the squadron, was now engaged with the first ship of the Austrian squadron. They were engaged gun for gun.

Now the second ships of each fleet came into action, and then the third. Ship after ship engaged the enemy, until the battle became general. For an instant, after each salvo, the rival squadrons were hidden from each other by the smoke of battle, but a brisk wind soon blew this away, and the cannonading continued.

Now one of the French vessels steered aside and dropped behind the line of battle. She was disabled.

The next ship moved up, and the French advance continued as before.

The torpedo craft of the French, gathered behind the French battle line dashed forward suddenly, headlong for the Austrian fleet. For two miles they sped on, apparently unnoticed by the enemy, then the great turret guns of the Austrians opened on them. The French torpedo craft began to suffer. Two together swung broadside to the Austrians, riddled with holes; the boiler of a third burst, the ship broke in two and sank almost instantly. But the others raced on.

Toward the big Austrian battleships they dashed. Austrian torpedo boats rushed out to meet them.

A sh.e.l.l from a French warship struck one of these, and she went to the bottom immediately. Others suffered by the French fire.

Four thousand yards from the Austrian fleet the French torpedo boats launched their torpedoes; then they fled back to the protection of the battleships, still engaged with the Austrian pursuers with small guns.

But they had done their work. A hundred torpedoes, driven by their motors of compressed air just below the surface, were steering automatically for the Austrian battleships.

Suddenly the fourth ship of the Austrian line staggered; a white spray of water leaped high in the air, and the Austrian vessel split into many pieces. The first torpedo had gone home. The fifth and sixth Austrian battleships also now leaped from the water, and then sank from sight. Farther back another Austrian ship dropped from the line of battle.

Now a school of Austrian torpedo craft dashed forward again.

They were met by a fierce hail of fire from the French, but in spite of this they succeeded in launching their torpedoes, and the French battleship, far back, suddenly disappeared from the surface of the Adriatic.

Now the battle grew so terrific that individual ship movements could not be kept track of. The Austrian torpedo craft retreated and the French gave chase. Jack and Frank saw all this, soaring above the sea, a part of it, and yet not a part of it, for so far they had had little to do.

Pierre, seated in front of Jack, suddenly uttered a shout.