"Nearly through," remarked Captain Cludderborough, who had taken his stand at Ralph's elbow. "You'll see the precious trestle-bridge in half a shake." As he spoke there was a loud roar. A dense cloud of smoke and dust leapt skywards at the distance of a furlong in front of the Tank. Almost simultaneously another explosion occurred at a similar distance to the rear. The Huns had sprung two land mines. The Tank, caught betwixt them, was trapped, and to impress the fact more strongly upon her hundreds of Germans appeared from the hitherto apparently deserted trenches. The cold muzzle of an automatic pistol was pressed against Ralph's temple and the mocking voice of the pseudo Captain Cludderborough remarked: "You will do well, sir, to order your men to surrender instantly. There is no escape. Give in without resistance and you will be accorded honourable treatment. I, Kapitan Karl von Hoerfelich, guarantee it." Von Hoerfelich was a resourceful German who, attracted by the offer of a large monetary reward for the capture of an intact British Tank, and animated by a strong desire to further the interest of the Imperial arms, had employed a daring ruse in order to attempt to achieve his object. Speaking English with the utmost fluency and having a thorough knowledge of British military matters--a knowledge gained by a seven years' exile in Great Britain, during which time he had taken up a menial position as a waiter at a famous Army Club--he submitted his plan to his superiors. In brief, he was to personate a British airman who had made a forced landing behind the German lines. The chance of meeting with a Tank operating far in advance of the infantry was realized, and so far he had successfully lured the landship into a formidable ambush. The moment had come for him boldly to proclaim his identity, his firm belief being that seeing the uselessness of resistance, the crew would tamely surrender at his summons. Completely taken aback when he felt the muzzle of the pistol against his temple, Second-Lieutenant Setley wisely refrained from obeying his natural inclination of grappling with his declared enemy. "Wouldn't it be advisable to stop the motors?" asked Ralph coolly. "We'll come an awful crash in that beastly hole ahead if we don't. It looks quite fifty feet deep, doesn't it?" Deceived by the apparent simplicity and urgency of the question, von Hoerfelich gave a brief glance through the slit in the armour in order to verify Setley's statement. Quick as was his action, Ralph was quicker. With a sharp upward movement of his elbow he jerked the German's automatic pistol. At the same time he ducked his head and gripped the Hun round the waist. Interlocked in a grim embrace, the two men struggled in the confined space while the Tank ambled uncontrolled towards the yawning mine-crater.