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.