But it didn’t last long, for the Roies soon learned what was up, and, breaking away from their opponents, crowded out through the gate, followed by a shower of missiles and maledictions. Cabot’s Vairkings were for following, but their master peremptorily called them back, and directed them to barricade the laboratory. It was well that he did so, for presently the heads of the enemy began to appear above the top of the fence. Evidently they had built a platform in the street. Soon arrows and pebbles began to fly at the windows of the house. The Vairkings replied with a volley, but Cabot cautioned them to conserve their ammunition, and watch him pick off with his rifle, one by one, the heads which showed themselves above the paling. This soon ceased to be interesting. So, giving the rifle and bandoleer to one of the more intelligent of his men, and instructing them to hold the laboratory at all costs, the earth-man set out, sword in hand, by the back way to rejoin Doggo and Quivven. The alleys which he threaded were deserted. He reached the rear of Jud’s compound without event, and passed in to one of the inclosures through a small and well concealed gate in the face of the wall. Quivven had pointed this route out to him before, but never had he traversed it farther than this point. He looked cautiously around him. Then he rubbed his eyes, and looked again! He could hardly believe his senses! There stood a Formian airplane in apparently perfect condition. Approaching it gingerly with drawn sword, he circled it carefully to make sure that it contained no enemies. But it was deserted. A hasty inspection disclosed that everything was in working order, except that the fuel tank was empty. Probably then, this was the plane at which he had fired. But no, for this plane did not even _smell_ of alcohol. The tank had evidently been dry for some time, and there was no sign of any bullet hole in it. Gradually the fact dawned on him that this was Doggo’s plane, which Jud had concealed from them for so long. He must reach Doggo and tell him. At the farther side of the inclosure from the side at which he had entered, there was a door. Myles raced toward it, and flung it open. Beyond it there was a second inclosure similar to the first. Myles raced across this one as well, and flung open another door, whereupon out poured a crowd of Roies, upsetting him and throwing him sprawling upon the ground. But they were as surprised as he was at the encounter, and this fact enabled him to regain his sword and scramble to his feet before they were upon him again, with parry and thrust. Good swordsman as he was, they had soon forced him, his back against the wall, to defend his life with his trusty wooden blade. Time and again one of their points would reach his tunic, but he kept his neck well guarded, and so was able to stand them off.