As he spoke a brilliant flash of lightning split the inky clouds which had now risen high over the western hills, and a deep roll of thunder came echoing up the valleys as if in answer to the roar of the cannonade on the sea. The moment every one was on board, Arnold gave the signal to ascend. As soon as the fan-wheels had raised them a hundred feet from the ground he gave the signal for full speed ahead, and the three air-ships swept upwards to the west as though to meet the coming storm. CHAPTER XXXII. THE END OF THE CHASE. The flight of the _Ithuriel_ and her consorts was so graduated, that as they rose to the level of the storm-cloud they missed it and passed diagonally beyond it at a sufficient distance to avoid disturbing the electrical balance between it and the earth. The object of doing so was not so much to escape a discharge of electricity, since all the vital parts of the machinery and the power-cylinders were carefully insulated, but rather in order not to provoke a lightning flash which might have revealed their rapid passage to the occupants of the _Lucifer_. As it was, they swept upwards and westward at such a speed that they had gained the cover of the thunder-cloud, and placed a considerable area of it between themselves and the town, long before the storm broke over Aberdeen, and so they were provided with ample shelter under, or rather over, which they were to make their attack on the _Lucifer_. They waited until the clouds coming up from the westward joined those which had begun to gather thick and black and threatening over the Russian fleet soon after the tremendous cannonade had begun. The shock of the meeting of the two cloud-squadrons formed a fitting counterpart to the drama of death and destruction that was being played on land and sea. The brilliant sunshine of the midsummer afternoon was suddenly obscured by a darkness born of smoke and cloud like that of a midwinter night. The smoke of the cannonade rose heavily and mingled with the clouds, and the atmospheric concussions produced by the discharge of hundreds of heavy guns, brought down the rain in torrents. Almost continuous streams of lightning flashed from cloud to cloud, and from heaven to earth, eclipsing the spouting fire of the guns, while to the roar of the bombardment was added an almost unbroken roll of thunder. Above all this hideous turmoil of human and elemental strife, the three air-ships floated for awhile in a serene and sunlit atmosphere. But this was only for a time. Arnold had taken the position and altitude of the _Lucifer_ very carefully by means of his sextant and compass before he rose into the air, and as soon as his preparations were complete he made another observation of the angle of the sun's elevation, allowing, of course, for his own, and placed his three ships as nearly perpendicular as he could over the _Lucifer_, floating on the under side of the storm-cloud.