In spite of the fact that the airship--so far as I could see through my glasses--did not appear to slow down or to be perceptibly racked by the gun-fire, I have no doubt what the end would have been if the test could have been pressed to its conclusion in an open country. But bringing a burning Zeppelin down across three or four blocks of thickly settled London was hardly a thing the Air Defence desired to do if it could possibly be avoided. The plan was carried to its conclusion with the almost mathematical precision that marked the preliminary searchlight work and gunnery. From the moment that it had burst into sight the raider had been emitting clouds of white gas to hide itself from the searchlights and guns, while the plainly visible movements of its lateral planes seemed to indicate that it was making desperate efforts to climb still higher into the thinning upper air. Neither expedient was of much use. The swirling gas clouds might well have obscured a hovering airship, but never one that was rushing through the air at seventy miles an hour, while, far from increasing its altitude, there seemed to be a slight but steady loss from the moment the guns ceased until, two or three miles further along, it was hidden from sight for a minute by a low-hanging cloud. Undoubtedly the aim of the gunners had been to “hole,” not to fire the marauder, and it must have been losing gas very rapidly even--as the climacteric moment of the attack approached--at the time increased buoyancy was most desirable. The “massed” searchlights of London “let go” shortly after the gun-fire ceased, and now, as the raider came within their field, the more scattered lights of the northern suburbs wheeled up and “fastened on.” The fugitive changed its course from north to north-easterly about this time, and the swelling clouds of vapour left behind presently cut off its foreshortened length entirely from my view. A heavy ground mist appeared to prevail beyond the heights to the north, and in the diffused glow of the searchlights that strove to pierce this mask my glasses showed the ghostly shadows of flitting aeroplanes--manœuvring for the death-thrust. The ground mist (which did not, however, cover London proper) kept the full strength of the searchlights from the upper air, and it was in a sky of almost Stygian blackness that the final blow was sent home. The farmers of Hertfordshire tell weird stories of the detonations of bursting bombs striking their fields, but all these sounds were absorbed in the twenty-mile air-cushion that was now interposed between my vantage point and the final scene of action.