There came a sudden loud report, a flash of flame and the knife clattered to the floor. Matin reeled and fell backward, and as he did so the second intruder pounced upon him and pinned him down.
Hal arose to his feet slowly. In his hand he held a smoking revolver. Chester, awakened by the shot, leaped quickly to his feet and his revolver flashed in his hand.
"What's happened?" he exclaimed.
"My friend Matin here tried to do for me," said Hal, pointing. "I shot him."
Chester rushed to the side of the two figures across the room. Then, for the first time, the identity of the second figure was established. It was Jules Clemenceau.
Hal also approached and bent over. He took Jules by the arm.
"What are you doing here?" he demanded.
"I followed Matin," replied Jules, rising to his feet. "I saw you when you entered the trench from the German lines. After you had gone I heard Matin threaten to kill you. We were relieved at the same time, and suspecting that he might be up to some mischief, I followed him. I was too far behind to do any good. I was so frightened that I could not cry out."
"How did you happen to see him, Hal?" asked Chester.
"I don't know," was Hal's reply. "I was awakened just as Jules here came through the window. I was about to call out when I saw Matin coming toward me with drawn knife. I drew my revolver quietly and waited. I wanted him to get close enough so I would not miss. My arm was doubled under me and I wasn't certain at that distance."