“I didn’t want him to see what disagreeable business we may have on our hands within a few minutes,” Dick whispered.  “But see here, Tom, I’ve just remembered that you didn’t pay Papa Prim for all his trouble, as you had planned.”

“Didn’t I?” Reade chuckled.  “I did it without any dispute from him, either.  Dick, I wrapped five twenty-dollar American gold pieces in cloth, so they wouldn’t jingle, and stuffed the whole tightly into a small canvas bag.  While you were talking I slipped it into one of his blouse pockets.  Papa Prim will find the money there, and he’ll know who put it there, but he won’t be able to return it.”

“American gold?” Dick echoed.  “If the Germans ever know of his having American gold they’ll think it reason enough for hanging him.”

“No, they won’t,” Tom retorted, “though they would undoubtedly think it reason enough for taking the money away from him.  But I’ve seen plenty of American gold in France, and plenty of English gold, too.  Anywhere in the world gold is gold, and having American gold isn’t proof, during this war, that the possessor got it from an American.  I’ll wager that there is plenty of American gold locked up even in Germany.  But the Germans will never find Papa’s gold.  Papa Prim will hide it until the day comes when, like the good Frenchman that he is, he can turn that gold into a French war bond.”

Nearing the former school-house that had been pointed out to them, the two chums took their bearings afresh.  Crossing the road one at a time, with utmost stealth, they reached the other side without having been challenged.

A little further on they espied a German sentry, pacing post.  Waiting until the fellow had gone to the furthest limit of his post, the chums, flat on their stomachs, crawled forward until, on looking backward, they judged it safe to rise and move on crouchingly.  Then they came in sight of the aviation station.

“Better crawl all the way now,” Dick whispered.  “We have reached the point where any attempt at speed will be sure to place a few bullets in our bodies.”

Tom nodded, without speaking.  It was trampled, withered grass through which they now crawled.  It offered fair concealment, but there was danger of making a noise that might betray them to a keen-eared sentry.

At last, near the first hangar, they reached a spot where two trees stood close together.  Crawling to this shelter, they still remained lying down, though the tree trunks gave them greater safety against being seen.

In front of the hangars paced a sentry; at the rear another soldier walked post.  At some distance from this latter sentry stood four tents, in which, Papa Prim had declared, slept the reliefs of the guard.

“I see how we could get the sentry at the rear,” Dick whispered, after a few minutes’ silent survey.  “But it’s at the front that we want to get in, and I don’t see any way of creeping up on the front sentry without the rear sentry seeing us and firing.  That would give the alarm.”