Close behind came another motor-cyclist He evidently was returning, having accomplished his errand, and was merely indulging in a friendly "speed-burst" with the other man. Slowing down he came to a standstill, and surveyed the wrecked machine.

"What's wrong, chum?" he asked inconsequently.

"He's got shell-shock, and is as obstinate as a mule," declared Archer.

There was method in his obstinacy, for seeing one of his own men the disabled dispatch-rider fumbled in his pouch and produced a sealed envelope.

The new-comer glanced at the address and the endorsement, "Highly urgent!"

"All right, chum; I'll see to it," said the man, and with a flying start he leapt into his saddle and rode furiously away.

A look of satisfaction spread over the face of the speechless motor-cyclist, then, staggering, he fell unconscious into the arms of Sergeant Archer, as a shell whizzing a couple of feet over the non-com.'s head buried itself deep in the ground, fortunately without exploding.

Willing hands relieved the sergeant of his burden and lifted the unconscious soldier into the Tank. A precious three minutes had been lost, but, did Ralph but know it, the retransmission of the dispatch was of far more vital importance than the work of succouring the stranded landship.

But by the time Setley's Tank arrived upon the scene the situation was serious enough. The bogged consort was lying on the floor of a vertical pit twenty feet in depth—a cunningly devised trap right in front of a hitherto masked position, where nearly a hundred of the Prussian Guard, supported by a strong machine-gun detachment, still held out.

Into the pit the Huns were lobbing bombs galore. These did but little damage, although the fumes were trying the crew of the trapped mammoth very severely, and, to make matters worse, the enemy had brought up a liquid flame apparatus from an undemolished dug-out and were about to squirt a fiery stream upon the helpless and hapless Tankers.