The Section was divided first into squads of ten under the command of an eleventh, who alone knew the leaders of the other squads in his neighbourhood. Ten of these squads made a company, commanded by one man, who was only known to the squad-captains, and who alone knew the captain of the regiment, which was composed of ten companies. The next step in the organisation was the brigade, consisting of ten regiments, the captains of which alone knew the commander of the brigade, while the commanders of the brigades were alone acquainted with the members of the Inner Circle or Executive Council which managed the affairs of the whole Section, and whose Chief was the only man in the Section who could hold any communication with the Inner Circle of the Brotherhood itself, which, under the immediate command of Natas, governed the whole organisation throughout the world. This description will serve for all the Sections, as all were modelled upon exactly the same plan. The advantages of such an organisation will at once be obvious. In the first place, no member of the rank and file could possibly betray more than ten of his fellows, including his captain; while his treachery could, if necessary, be made known in a few hours to ten thousand others, not one of whom he knew, and thus it would be impossible for him to escape the invariable death penalty. The same is, of course, equally true of the captains and the commanders. On the other hand, the system was equally convenient for the transmission of orders from headquarters. An order given to ten commanders of brigades could, in a single night, be transmitted individually to the whole of the Section, and yet those in command of the various divisions would not know whence the orders came, save as regards their immediate superiors. It will be necessary for the reader to bear these few particulars in mind in order to understand future developments, which, without them, might seem to border on the impossible. It is only necessary to add that the full fighting strength of the four Sections of the Brotherhood amounted to about twelve millions of men, a considerable proportion of whom were serving as soldiers in the armies of the League and the Alliance, and that in its cosmopolitan aspect it was known to the rank and file as the Red International, whose members knew each other only by the possession of a little knot of red ribbon tied into the button-hole in a peculiar fashion on occasions of meetings for instruction or drill. The three lights burning in the form of a triangle in the window of the house were a prearranged signal to avoid mistake on the part of those on board the air-ship. When they reached the earth, Arnold, acting under the instructions of Tremayne, who was his superior on land though his voluntary subordinate when afloat, left the _Ithuriel_ and her crew in charge of Lieutenant Marston and Andrew Smith, the coxswain.