"Looks like a bit of a scrap after all," he remarked.

CHAPTER XXVI

HER LAST BOLT

It was a formidable trap. Already there was less than seven miles between the jaws of these rapidly closing pincers as the two divisions of hostile torpedo-craft steamed towards each other. To make matters more unpleasant a Zeppelin—a comparatively rare bird in the latter stages of the Great War—appeared from the east'ard, possibly from the airsheds at Tondern, and without venturing to make a direct attack was evidently communicating by wireless with the torpedo boats.

"Hoist our Ensign!" ordered Morpeth. "That'll show 'em we aren't going to take it lying down. We'll give them a run for their money."

Up rose the White Ensign bravely in the breeze. Simultaneously came the tell-tale bark of a torpedo. With a quick movement of her helm Q 171 avoided the missile, but even as she did so another torpedo came hissing under the waves. To avoid the new menace by alteration of course was impossible. The Q-boat carried too much way to reverse and gather sternway in time. To Meredith, standing by the after quick-firer, the sight of the approaching torpedo was a nerve-thrilling one. Gripping the rail, he watched its approach as it headed almost under that part of the deck on which he stood. Mechanically he gripped the wire and waited. He could do nothing: not even run a few paces in order to avoid, if possible, the direct effect of the explosion. He felt much as the French aristocrats must have felt when they lay strapped to the bed of the guillotine waiting for the fatal knife to fall....

"How much longer?" he thought. "How much——"

"Stand by with the depth-charges," roared Morpeth, as Q 171 swung round and made straight for the spot where the twin periscopes of a U-boat were disappearing.

The torpedo had been aimed truly, save in one respect. The commander of the U-boat had gauged the draught of the mystery ship by that of his own craft, forgetting that, although above water Q 171 resembled a German submarine, her depth beneath the water-line was only seven feet six inches. The missile had travelled harmlessly under her to finish its run three miles beyond.