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 slowly. Presently they will hear a commotion in the enemy trench; but they need not hurry and whatever they do, have them come quietly. You might also warn them that I may be in the trench and that I do not care to be shot or bayoneted."

"And that is all," queried Capell, after directing an officer to give Tarzan a hand grenade; "you will empty the trench alone?"

"Not exactly alone," replied Tarzan with a grim smile; "but I shall empty it, and, by the way, your men may come in through the tunnel from the listening post if you prefer. In about half an hour, Colonel," and he turned and left them.

As he passed through the camp there flashed suddenly upon the screen of recollection, conjured there by some reminder of his previous visit to headquarters, doubtless, the image of the officer he had passed as he quit the colonel that other time and simultaneously recognition of the face that had been revealed by the light from the fire. He shook his head dubiously. No, it could not be and yet the features of the young officer were identical with those of Fräulein Kircher, the German spy he had seen at German headquarters the night he took Major Schneider from under the nose of the Hun general and his staff.

Beyond the last line of sentinels Tarzan moved quickly in the direction of Numa, the lion. The beast was lying down as Tarzan approached, but he rose as the ape-man reached his side. A low whine escaped his muzzled lips. Tarzan smiled for