The three hardly knew what to do. And yet, now, there seemed to be but one thing--they must make all haste in the direction of the American lines. At any moment the searching squad might come back, or another might make its appearance, for the Germans would not let the inmates of the prison camp get away without an effort to bring them back. "Well, this Captain Dickerson has an American name all right, and he may be a German spy," said Bob. "But he isn't within the American lines just at present, so he has a right to wear a German uniform I suppose. Remember how he hesitated about giving his name? Maybe he made one up." "He won't wear that uniform long if any of our boys catch him!" declared Jimmy. "Look here, fellows. His saving of our lives was a fine thing, and we can never forget it. But, at the same time, duty is duty, and our highest duty is not to the man toward whom we feel so grateful, but toward our own army and the boys of the Five Hundred and Ninth. If we ever get back to our friends we'll have to denounce Captain Frank Dickerson, or whoever that fellow it. That's all there is to it" "I--I guess you're right," agreed Bob, slowly. "It's tough, but it has to be done!" "If we get the chance!" added Roger. "Of course! If we get the chance," agreed Jimmy. "Mind, I don't say that we actually have to give him up, or capture him," he added. "That would be too much. But it's our duty to tell what we have seen." The others nodded their heads. "We haven't a chance to capture him now." Jimmy resumed. "He's armed, and we're not. Besides, even if we three could overpower him, he might signal to the Germans who were just here. No, all we can do is to wait and see what happens. And the first thing we'd better do is to get out of this neighborhood. It isn't healthy!" They looked once more in the direction of "Captain Frank Dickerson," as he had called himself. He had folded up his papers and was about to rise from the log. "Duck, fellows! He's looking this way!" hoarsely whispered Bob, and the boys dropped behind a fallen tree. The officer in the German uniform did, indeed, look toward the woods, but he made no advance that way, and presently walked off in the direction taken by the searching party which had been so close to the three former captives, evidently without knowing it. "And now we'll make tracks the other way," decided Jimmy, and they put some distance between themselves and the man they believed a spy before they halted to eat. "I'm glad I didn't have my five thousand francs with me when we fell into the hands of the Germans," said Sergeant Jimmy, as they sat and rested after the rather meager meal. "Why?" asked Bob. "Maybe you could have bought some food, by bribing a guard."