For all these reasons--and because Mahan was too busy and too grumpy to bother with him--Bruce elected to stay where he was, for a while, and share the Missourian's vigil. So, when the rest of the party moved along to the next sentry-go, the dog remained.
The Missourian was only too glad to have him do so. It is tedious and stupid to pace a desolate beat, alone, at dead of night, after a day of hard fighting. And the man welcomed the companionship of the dog.
For a time, as the Missourian paced his solitary stretch of broken and shrub-grown ground, Bruce gravely paced to and fro at his side. But presently this aimless promenade began to wax uninteresting. And, as the two came to the far end of the beat, Bruce yawned and lay down. It was pleasanter to lie there and to watch the sentinel do the walking.
Stretched out, in a little grass-hollow, the dog followed blinkingly with his soft brown eyes the pendulumlike progress of his friend. And always the dog's plumed tail would beat rhythmic welcome against the ground as the sentry approached him.
Thus nearly an hour wore on. A fat moon butted its lazy way through the smoke-mists of the eastern skyline.
Then something happened--something that Bruce could readily have forestalled if the wind had been blowing from the other direction, and if a dog's eyes were not as nearsighted as his nose is farsmelling.
The Missourian paused to run his hand caressingly over the collie's rough mane, and moved on, down the lonely beat. Bruce watched his receding figure, drowsily. At the end of ninety yards or more, the Missourian passed by a bunch of low bushes which grew at the near side of a stretch of hilly and shellpocked ground. He moved past the bushes, still watched by the somewhat bored dog.
It was then that Bruce saw a patch of bushshadow detach itself from the rest, under the glow of the rising moon. The shadow was humpy and squat. Noiseless, it glided out from among the bushes, close at the sentry's heels, and crept after him.
Bruce pricked his ears and started to get up. His curiosity was roused. The direction of the wind prevented him from smelling out the nature of the mystery. It also kept his keen hearing from supplying any clue. And the distance would not permit him to see with any distinctness.
Still his curiosity was very mild. Surely, if danger threatened, the sentinel would realize it. For by this time the Shadow was a bare three feet behind him near enough, by Bruce's system of logic, for the Missourian to have smelled and heard the pursuer.
So Bruce got up, in the most leisurely fashion, preparatory to strolling across to investigate. But at almost his first step he saw something that changed his gracefully slouching walk into a charging run.
The Shadow suddenly had merged with the sentinel. For an instant, in stark silence, the two seemed to cling together. Then the Shadow fled, and the lanky Missourian slumped to the earth in a sprawling heap, his throat cut.
The slayer had been a deft hand at the job. No sound had escaped the Missourian, from the moment the stranglingly tight left arm had been thrown around his throat from behind until, a second later, he fell bleeding and lifeless.
In twenty leaping strides, Bruce came up to the slain sentinel and bent over him. Dog-instinct told the collie his friend had been done to death. And the dog's power of scent told him it was a German who had done the killing.
For many months, Bruce had been familiar with the scent of German soldiers, so different from that of the army in which he toiled.
And he had learned to hate it, even as a dog hates the vague "crushed cucumber" smell of a pitviper. But while every dog dreads the viper-smell as much as he loathes it, Bruce had no fear at all of the boche odor. Instead, it always awoke in him a blood-lust, as fierce as any that had burned in his wolf-ancestors.
This same fury swept him now, as he stood, quivering, above the body of the kindly man who so lately had petted him; this and a craving to revenge the murder of his human friend.
For the briefest time, Bruce stood there, his dark eyes abrim with unhappiness and bewilderment, as he gazed down on the huddled form in the wet grass. Then an electric change came over him. The softness fled from his eyes, leaving them bloodshot and blazing. His great tawny ruff bristled like an angry cat's. The lazy gracefulness departed from his mighty body. It became tense and terrible. In the growing moonlight his teeth gleamed whitely from under his upcurled lip.
In a flash he turned and set off at a loping run, nose close to ground, his long stride deceptively swift. The zest of the man-hunt had obsessed him, as completely as, that day, it had spurred the advance of the "Here-We-Comes."The trail of the slayer was fresh, even over such broken ground.
Fast as the German had fled, Bruce was flying faster. Despite the murderer's long start, the dog speedily cut down the distance between his quarry and himself. Not trusting to sight, but solely to his unerring sense of smell. Bruce sped on.
Then, in a moment or two, his hearing re-enforced his scent. He could catch the pad-pad-pad of running feet. And the increasing of the sound told him he was gaining fast.
But in another bound his ears told him something else--something he would have heard much sooner, had not the night wind been setting so strongly in the other direction. He heard not only the pounding of his prey's heavy-shod feet, but the soft thud of hundreds--perhaps thousands--of other army shoes. And now, despite the adverse wind, the odor of innumerable soldiers came to his fiercely sniffing nostrils. Not only was it the scent of soldiers, but of German soldiers.
For the first time, Bruce lifted his head from the ground, as he ran, and peered in front of him. The moon had risen above the low-lying horizon vapors into a clear sky, and the reach of country was sharply visible.
