"I guess we'll know soon enough," was Jack's reply.

They halted before their commander and came to attention.

"If I am not mistaken," said Captain Dreyfuss, pointing ahead, "that dark hull there is an Austrian vessel, whether a warship or not I cannot say. Now, the success of this venture depends upon silence. A shot from a big gun aboard that ship would mean failure for us. I have called you two lads to ask if you would like to undertake a dangerous task?"

"Yes, sir," replied Jack quietly.

"We shall be only too glad," said Frank eagerly.

"Well, then," continued, Captain Dreyfuss, "I believe that by a quick and silent dash you may be able to board her. If You are successful in getting aboard, your first duty will be to prevent the firing of one of the big guns. Luckily, we are still far from shore, so the sounds of a hand-to-hand struggle are not likely to be overheard. Are you willing to undertake this mission?"

"Yes, sir," replied both lads in a single voice.

"Good! You shall have fifty men. With the effect of a surprise,
I believe this should be enough."

Half an hour later, while the Marie Theresa remained stationary, not even showing a light, Frank and Jack, with five small boats at their command, were creeping silently toward the Austrian vessel. Nearer and nearer they approached, and at length the first boat scraped the side of the larger vessel.

So far their presence had not been discovered.