And slowly and cautiously they entered the tunnel, Roger and Jimmy in the lead. One of them flashed a pocket torch at intervals, for the way was rough and treacherous.
Suddenly Roger, who had got a little in advance of Jimmy, caught the latter by the arm, and, pointing ahead, in a whisper, asked:
"What's that? Who are they?"
Jimmy, looking to where his friend pointed, uttered a guarded exclamation. He was gazing at a strange sight.
[CHAPTER III]
ANOTHER PUZZLE
"What's the matter up ahead there?" came the demand from Schnitzel, who, with Bob, was helping along the disabled Iggy. "Why don't you go on, Jimmy?"
"Is the way blocked?" asked Bob. "Are we stuck again?"
"Keep still back there!" fiercely whispered Sergeant Jimmy. "Don't make such a row, or they'll hear you!"
"Who?" asked Franz, and this time he lowered his voice to the desired pitch. "Are there some Germans up ahead? Did the blowing up of our dugout mean that our lines are smashed?" His voice was anxious. He and Bob could not see beyond the place where Roger and Jimmy had come to a halt.