Roque gave Billy a look of stern rebuke.

Billy was not worried about the answer he did not get in words. He saw a certain bystander uncover a fine set of teeth, and that was enough.

The play at the theater was a war drama, which was not at all like the real thing, but Billy was so delighted with the success of his stratagem at the café door that he was inclined to applaud at both the right and the wrong time.

Henri held his praise for his chum, when the two retired for the night.

“It looks like a case of ‘diamond cut diamond’ to me,” he observed, “for you can wager that they would never send a fool over here to buck against the like of Roque.”

“I bet they wouldn’t,” was Billy’s sleepy opinion.

The next evening the boys were back in the air camp at Hamburg.

“You have your hands full, lieutenant,” remarked Roque, with a wink and a nod at our Aviator Boys.

There is no telling what he might have said had he known what Billy had put over on him the night before.

“Well,” said the lieutenant, “though it appears that Roque has the first call on you, I’m going to keep you busy between times, and as there is nobody around now to scuttle your air mounts you can fly to your hearts’ content.”