Down into the cellar he sprang, gasping in the noisome fumes. His electric torch, still gleaming, lay on the floor. Near the mouth of the tunnel he saw the heroic old Serb prostrate. He rushed to him, stooped over him. Was he yet alive? Burton could not tell. Exerting almost superhuman strength he managed to hoist the big man to his back, and staggered with him across the cellar, up the steps, and across the floor. Almost broken down under the weight of his burden, he was just reaching the entrance when there was an appalling crash. The tower tottered and collapsed, and the two men fell together. [Illustration: A PERILOUS MOMENT] VII When Burton came to himself, it was to find an officer in khaki, with the red cross of the R.A.M.C. on his sleeve, bending over him. "That’s all right!" said a cheery voice. "He’ll do now!" "Where am I? Where’s Marco?" Burton asked faintly. "The old Serb? Don’t worry about him. He has concussion, but he’s a tough old boy, and we’ll pull him through." "And the Bulgars?" "Toiling like niggers to make a new track a mile from here. It’s all right. Take this morphine tablet. You shall hear all you want to know, twenty-four hours from now. Rather hard luck to be knocked out twice in one day, I must say." Young Marco, after long wandering and losing his way several times, had lighted on a part of the British rearguard and delivered his note, which passed from a subaltern through his company commander and colonel until it came to the hands of the brigadier. An examination of the map decided that officer to dispatch a regiment of light cavalry to the tower. They reached it some ten minutes after it fell, having heard the outlines of the story from Captain Enderby, whom they met a few hundred yards away, keeping an eye on the three prisoners, as he said with a smile. Milosh and Nuta, who were returning to the tower when the explosion occurred, had narrowly escaped burial in the ruins. Rushing forward through the smoke and dust, they had found the two men unconscious but alive, protected by the only half-destroyed arch of the entrance. The shelling had ceased with the fall of the tower; the track had been rendered utterly impassable by the explosion of the mine; and before the enemy were aware of the presence of the British cavalry, and their guns again came into play, the regiment had withdrawn with Burton, his party and the prisoners, and were well on their way to the British lines.