To the eastward of these about half the fleet of the League, in but little better condition, was advancing in now overwhelming force upon them, and behind these again a swarm of troopships and transports were heading out from the French shore. About an hour after dawn the _Centurion_, the last of the British battleships, was struck by one of the submarine torpedoes, broke in two, and went down with her flag flying and her guns blazing away to the last moment. So ended the battle of Dover, the most disastrous sea-fight in the history of the world, and the death-struggle of the Mistress of the Seas. The last news of the tremendous tragedy reached the now panic-stricken capital half an hour before the receipt of similar tidings from Harwich, announcing the destruction of the defending fleet and forts, and the capture of the town by exactly the same means as those employed against Dover. Nothing now lay between London and the invading forces but the utterly inadequate army and the lines of fortifications, which could not be expected to offer any more effective resistance to the assault of the war-balloons than had those of the three towns on the Kentish coast. [Footnote 1: _The Naval Annual_ for 1893 mentions two types of submarine boats, the _Zédé_ and the _Goubet_, both belonging to the French navy, which had then been tried with success. The same work mentions no such vessels belonging to Britain, nor yet any prospect of her possessing one. The effects described here as produced by these terrible machines are little, if at all, exaggerated. Granted ten years of progress, and they will be reproduced to a certainty.--AUTHOR.] [Illustration: "The _Centurion_, the last of the British battleships, was struck by one of the submarine torpedoes." _See page 300._] CHAPTER XL. BELEAGUERED LONDON. A month had passed since the battle of Dover. It had been a month of incessant fighting, of battles by day and night, of heroic defences and dearly-bought victories, but still of constant triumphs and irresistible progress for the ever-increasing legions of the League. From sunrise to sunrise the roar of artillery, the rattle of musketry, and the clash of steel had never ceased to sound to the north and south of London as, over battlefield after battlefield, the two hosts which had poured in constant streams through Harwich and Dover had fought their way, literally mile by mile, towards the capital of the modern world.