She showed no lights, and so in order to keep her in view it was necessary for her pursuers to keep their search-lights constantly sweeping the skies ahead of them, lest they should lose sight of her in the semi-darkness. This placed the Aerian fleet at a serious disadvantage, which very soon became apparent, for before the pursuit had lasted an hour the chase opened fire with her stern guns and shell after shell charged with some terrific explosive began bursting along the line of the pursuing squadron, producing fearful concussions in the atmosphere, and causing the pursuers to rock and toss in the shaken air like ships on a stormy sea. The _Ithuriel_ and the _Ariel_, at the two extremities of the semicircle, replied with a rapid converging fire from their bow guns in the hope of reaching the now invisible chase. All the projectiles were, of course, time-shells, but the speed at which the vessels were travelling not only made the aim hopeless, but caused such an in-rush of air into the muzzles of the guns that the projectiles, checked in their course through the barrels, flew wild and exploded at random, often in dangerous proximity to the vessels themselves. Hence, after about a dozen shots had been fired, the commanders of the two vessels found themselves compelled to cease firing, and to trust to speed alone to overtake the enemy. On the other hand, this disadvantage to them was all in favour of the chase, which was able to work her two stern guns without the slightest impediment. Before long she got the range of her pursuers, and at last a shell burst fairly under one of the smaller vessels. A brilliant flash of light, blue as the lightning-bolt, illuminated her for an instant, and in that instant her companions saw her stop and shiver like a stricken bird in mid-air, and then plunge downwards like a stone to the earth. Olga Romanoff, standing on the deck of what had once been the _Ithuriel_, flag-ship of the Aerian fleet, and now renamed the _Revenge_, saw this catastrophe, as the others had done, through her night-glasses. She lowered them from her eyes, and said to a dark-eyed, black-haired young fellow, who was commanding the gun that had done the execution-- “Bravo, Boris Lossenski! Did you sight that gun?” Boris drew himself up and saluted, saying-- “Yes, Majesty, I did.” “Then for that you shall be a Prince henceforth, and if you can bring another down you shall command an air-ship of your own when this fight is over.” Boris saluted again, and ordered the gun to be reloaded. Before it could be discharged a shell from the port gun, which had been fired as Olga spoke, struck another of the Aerian vessels square on the fore-quarter. The flash of the exploding projectile was almost instantaneously followed by the outburst of a vast dazzling mass of flame which illumined for the instant the whole scene of the aerial battle.