Every moment the uproar became more deafening. From all sorts of unsuspected places and buildings came the lightning quiver of the guns, followed by the shrieking of the shells. Right on to the tops of the houses between where he was standing and the Carlton, another aeroplane fell, smashing the chimneys and the windows and hanging there like a gigantic black bat. There was not a soul anywhere near him, but by the occasional flashes of light Thomson could see soldiers and hurrying people in the Admiralty Square, and along the Strand he could hear the patter of footsteps upon the pavement. But he himself remained alone, a silent, spellbound, fascinated witness of this epic of slaughter and ruin.

Then came what seemed to him to be its culmination. High above his head he was suddenly conscious of a downward current of air. He looked up. The shouting voices, apparently from the falling clouds, voices unfamiliar and guttural, warned him of what was coming. The darkness which loomed over him, took shape. He turned and ran for his life. Only a little way above his head a storm of shrapnel now was streaming from the lowered guns of the Admiralty.

Turning back to look, he saw, scarcely fifty yards above him, the falling of a huge Zeppelin. He felt himself just outside its range and paused, breathless.

With a crash which seemed to split the air, the huge structure fell. The far end of it, all buckled up, rested against the back of the Admiralty. The other end was only a few yards from where Thomson stood, at the bottom of the steps leading up into Pall Mall. A dozen searchlights played upon it. Men suddenly appeared as though from underneath. Some of them stood for a moment and swayed like drunken men, others began to run. Round the corner from the Admiralty Square a little company of soldiers came with fixed bayonets. There was a shout. Two of the men ran on.

Thomson heard the crack of a rifle and saw one of them leap into the air and collapse. The other one staggered and fell on his knees. A dozen of them were there together with their hands stretched to the skies. Then Thomson was conscious that one of the oil-clad figures was coming in his direction, making for the steps, running with swift, stealthy gait. A flash of light gleamed upon the fugitive for a moment. He wore a hat like a helmet; only his face, blackened with grease, and his staring eyes, were visible. He came straight for Thomson, breathing heavily.

"Hands up!" Thomson cried.

The man aimed a furious blow at him. Thomson, who quite unconsciously had drawn a revolver from his pocket, shot him through the heart, watched him jump up and fall, a senseless, shapeless heap upon the bottom of the steps, and, with a queer instinct of bloodthirstiness, ran down the line of the wrecked Zeppelin, seeking for more victims. The soldiers were coming up in force now, however, and detachments of them were marching away their prisoners. Another company was stationed all around the huge craft, keeping guard. Thomson walked back once more towards the Admiralty. The sky was still lurid with the reflection of many fires but the roar of the guns had diminished, and for several minutes no bomb had been thrown. With the revolver in his hand still smoking, he ran into a man whom he knew slightly at the Admiralty.

"Thomson, by God!" the man exclaimed. "What are you doing with that revolver?""I don't know," he answered. "I've just shot one of those fellows from the Zeppelin. How are things going?""There are six Zeppelins down in different parts, and a couple of dozen aeroplanes," the other replied. "Woolwich is safe, and the Houses of Parliament and Whitehall. Heaps of reports to come in but I don't believe they've done much damage."Thomson passed on. It was lighter now and the streets were thronged with people. He turned once more towards the Strand and stood for a moment in Trafalgar Square. One wing of the National Gallery was gone, and the Golden Cross Hotel was in flames. Leaning against the Union Club was another fallen aeroplane. Men and women were rushing everywhere in wild excitement. He made his way down to the War Office. It seemed queer to find men at work still in their rooms. He sent Ambrose for an orderly and received a message from headquarters.

"Damage to public buildings and property not yet estimated. All dockyards and arsenals safe, principal public buildings untouched. Only seventeen dead and forty injured reported up to five minutes ago. Great damage done to enemy fleet; remainder in full retreat, many badly damaged. Zeppelin just down in Essex, four aeroplanes between here and Romford."Thomson threw down his revolver.

"Well," he muttered to himself, "perhaps London will believe now that we are at war!"