Presently, as he passed through a clump of bushes, he came to the edge of a low cliff and saw upon a ledge some fifteen feet below him a German soldier prone behind an embankment of loose rock and leafy boughs that hid him from the view of the British lines. The man must have been an excellent shot, for he was well back of the German lines, firing over the heads of his fellows. His high-powered rifle was equipped with telescope sights and he also carried binoculars which he was in the act of using as Tarzan discovered him, either to note the effect of his last shot or to discover a new target. Tarzan let his eye move quickly toward that part of the British line the German seemed to be scanning, his keen sight revealing many excellent targets for a rifle placed so high above the trenches.
The Hun, evidently satisfied with his observations, laid aside his binoculars and again took up his rifle, placed its butt in the hollow of his shoulder and took careful aim. At the same instant a brown body sprang outward from the cliff above him. There was no sound and it is doubtful that the German ever knew what manner of creature it was that alighted heavily upon his back, for at the instant of impact the sinewy fingers of the ape-man circled the hairy throat of the Boche. There was a moment of futile struggling followed by the sudden realization of dissolution—the sniper was dead.
Lying behind the rampart of rocks and boughs, Tarzan looked down upon the scene below. Near at hand were the trenches of the Germans. He could see officers and men moving about in them and almost in front of him a well-hidden machine gun was traversing No Man's Land in an oblique direction, striking the British at such an angle as to make it difficult for them to locate it.
Tarzan watched, toying idly with the rifle of the dead German. Presently he fell to examining the mechanism of the piece. He glanced again toward the German trenches and changed the adjustment of the sights, then he placed the rifle to his shoulder and took aim. Tarzan was an excellent shot. With his civilized friends he had hunted big game with the weapons of civilization and though he never had killed except for food or in self-defense he had amused himself firing at inanimate targets thrown into the air and had perfected himself in the use of firearms without realizing that he had done so. Now indeed would he hunt big game. A slow smile touched his lips as his finger closed gradually upon the trigger. The rifle spoke and a German machine gunner collapsed behind his weapon. In three minutes Tarzan picked off the crew of that gun. Then he spotted a German officer emerging from a dugout and the three men in the bay with him. Tarzan was careful to leave no one in the immediate vicinity to question how Germans could be shot in German trenches when they were entirely concealed from enemy view.
Again adjusting his sights he took a long-range shot at a distant machine-gun crew to his right. With calm deliberation he wiped them out to a man. Two guns were silenced. He saw men running through the trenches and he picked off several of them. By this time the Germans were aware that something was amiss—that an uncanny sniper had discovered a point of vantage from which this sector of the trenches was plainly visible to him. At first they sought to discover his location in No Man's Land; but when an officer looking over the parapet through a periscope was struck full in the back of the head with a rifle bullet which passed through his skull and fell to the bottom of the trench they realized that it was beyond the parados rather than the parapet that they should search.
One of the soldiers picked up the bullet that had killed his officer, and then it was that real excitement prevailed in that particular bay, for the bullet was obviously of German make. Hugging the parados, messengers carried the word in both directions and presently periscopes were leveled above the parados and keen eyes were searching out the traitor. It did not take them long to locate the position of the hidden sniper and then Tarzan saw a machine gun being trained upon him. Before it had gotten into action its crew lay dead about it; but there were other men to take their places, reluctantly perhaps; but driven on by their officers they were forced to it and at the same time two other machine guns were swung around toward the ape-man and put into operation.
Realizing that the game was about up Tarzan with a farewell shot laid aside the rifle and melted into the hills behind him. For many minutes he could hear the sputter of machinegun fire concentrated upon the spot he had just quit and smiled as he contemplated the waste of German ammunition.
"They have paid heavily for Wasimbu, the Waziri, whom they crucified, and for his slain fellows," he mused; "but for Jane they can never pay—no, not if I killed them all."
After dark that night he circled the flanks of both armies and passed through the British out-guards and into the British lines. No man saw him come. No man knew that he was there.
Headquarters of the Second Rhodesians occupied a sheltered position far enough back of the lines to be comparatively safe from enemy observation. Even lights were permitted, and Colonel Capell sat before a field table, on which was spread a military map, talking with several of his officers. A large tree spread above them, a lantern sputtered dimly upon the table, while a small fire burned upon the ground close at hand. The enemy had no planes and no other observers could have seen the lights from the German lines.
The officers were discussing the advantage in numbers possessed by the enemy and the inability of the British to more than hold their present position. They could not advance. Already they had sustained severe losses in every attack and had always been driven back by overwhelming numbers. There were hidden machine guns, too, that bothered the colonel considerably. It was evidenced by the fact that he often reverted to them during the conversation.
"Something silenced them for a while this afternoon," said one of the younger officers. "I was observing at the time and I couldn't make out what the fuss was about; but they seemed to be having a devil of a time in a section of trench on their left. At one time I could have sworn they were attacked in the rear—I reported it to you at the time, sir, you'll recall—for the blighters were pepperin' away at the side of that bluff behind them. I could see the dirt fly. I don't know what it could have been."
There was a slight rustling among the branches of the tree above them and simultaneously a lithe, brown body dropped in their midst. Hands moved quickly to the butts of pistols; but otherwise there was no movement among the officers. First they looked wonderingly at the almost naked white man standing there with the firelight playing upon rounded muscles, took in the primitive attire and the equally primitive armament and then all eyes turned toward the colonel.
"Who the devil are you, sir?" snapped that officer.
"Tarzan of the Apes," replied the newcomer.
"Oh, Greystoke!" cried a major, and stepped forward with outstretched hand.
"Preswick," acknowledged Tarzan as he took the proffered hand.
"I didn't recognize you at first," apologized the major. "The last time I saw you you were in London in evening dress. Quite a difference—'pon my word, man, you'll have to admit it."
Tarzan smiled and turned toward the colonel. "I overheard your conversation," he said. "I have just come from behind the German lines. Possibly I can help you."
The colonel looked questioningly toward Major Preswick who quickly rose to the occasion and presented the ape-man to his commanding officer and fellows. Briefly Tarzan told them what it was that brought him out alone in pursuit of the Germans.
"And now you have come to join us?" asked the colonel.