Getting permission for a week's absence was not as easy as securing permission to go to Paris. But Tom and Jack waited until after a sharp engagement, during which they distinguished themselves by bravery in. the air, assisting in bringing down some Hun planes, and then their petition was favorably acted on.

Behold them next, as a Frenchman might say, on their way to their former squadron, where they were welcomed with open arms. They had to take the commanding officer into their confidence, but he offered no objection to their scheme. They must go alone, however, and without his official knowledge or sanction, since it was not strictly a military matter.

And so Tom and Jack were furnished with the best and speediest machine in their former camp, and one bright day, following a hard air battle in which the Huns were worsted, they set out to drop the letters and packages over the prison camp where Harry Leroy was held.

“Well, how do you feel about it?” asked Jack, as he and his chum stepped into their trim machine.

“Not at all afraid, if that's what you mean.”

“No. And you know I didn't. I mean do you think we'll pull it off?”

“I have a sneaking suspicion that we shall.”

“And so have I. It's a desperate chance, but it may succeed. Only if it does, and we get Harry's hopes raised for a rescue, how are we going to pull that off?”

“That's another story,” remarked Tom. “Another story.”

They mounted into the clear, bright air, and proceeded toward the German lines. Would they reach their objective, or would they be shot down, to be either killed or made prisoners themselves? Those were questions they could not answer. But they hoped for the best.