We first saw him over the Estuary, slightly to the south of us, flying at a height that we estimated at about 9,000 feet. There was great excitement. Anti-aircraft guns at once opened on him, but they failed to hit him. Lost to our view in a mist, he was not seen again until well up the river, and from the reports afterwards published it seems that fire was once more opened on him from our guns. Rising higher to escape our shells, he made a complete half-circle. By now, several British aeroplanes were in pursuit, and the German, seeing that it was hopeless to attempt to go farther, turned back. Thousands of people had a good view of this--the first real air-battle on the British coast. Shells were bursting in the air apparently all round the German. Time after time it seemed that he had been hit, yet time after time he escaped. Men could not fail to admire the skill with which he handled his machine. At one point a sudden dip of the aeroplane seemed to show that a shot had got home. Still, however, according to what I heard afterwards, he kept on, circling, dodging, twisting, climbing and diving with almost incredible swiftness to escape his pursuers. He made straight for the sea--and escaped. Weeks afterwards a rumour was received that some fishermen had found a body away out in the sea which was believed to be that of the German airman, but no satisfactory confirmation was ever published. It was that incident which first set me thinking of how to combat hostile aircraft. At once I thought of aeroplane versus aeroplane, but when three weeks later, two Zeppelins came over to the east coast to reconnoitre, and dropped nine bombs, blowing to pieces two old people, then my attention was turned towards the Zeppelin, and in Teddy Ashton I found a ready and enthusiastic assistant. This raid, and those which followed on points on the north-east coast, small as their immediate results were, yet demonstrated one thing. The German Press proclaimed that German genius had at last ended the legend that England was invulnerable owing to her insularity. An English writer had pointed out that it was certainly proved that the seas no longer protected England from attack. She was no longer an island. Should she hope to keep her shores inviolate, and to allow her people to live in the safety that they had enjoyed for so many centuries, she must be prepared to meet invaders from the sky, as well as on the water. Both Teddy and myself saw that the coming of the German airship was the beginning of a new chapter in the history of this country. The real German defence was summed up in a semi-official message published, which read: "The German nation has been forced by England to fight for her existence, and cannot be forced to forego legitimate self-defence, and will not do so, relying upon her good right." Her good right! Had Germany a right to drop bombs blindly on open villages, and kill our women and babes at night?