The last news that Tom had had of Rabig was that he had been taken prisoner in the preceding Fall.  He had not known, of course, of Nick's alleged escape from German captivity, and of his return to the American lines, but his quick mind readily reached the correct conclusion.  He had always distrusted Rabig and had felt sure that the fellow was at heart a traitor.  He was morally certain that the German corporal, whom Nick had been assigned to guard, had escaped with Rabig's connivance, and he remembered what Frank had told him about hearing Rabig's voice in the woods the night the German spy was shot.  But Rabig's cunning, or perhaps his luck, had prevented his treachery being proved.