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 classes, 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 shell 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.