His head-quarters he established in the aoul Akhulgo, a Tartar name signifying a gathering place in time of trouble, and now famous in Circassian annals for the siege sustained there in the campaign following. It is situated in the district of Koissubui, on the right bank of the Andian branch of the Koissu near its junction with the main stream, only a short distance northwest of Himri, and about sixty wersts by the most direct route from the Russian line. Like an eagle's nest it is perched on the top of an isolated, conical peak of rock, rising on one side perpendicularly six hundred feet above the Koissu, and of such fantastic formation as to lead to the saying that it was by divine permission the work of the devil. The river nearly surrounds it. On the top is the aoul, which is divided into old and new Akhulgo, being together a circumference of something less than a couple of wersts. A narrow path admitting only two persons to walk abreast, winds up the rock, which has three terraces formed by nature, and favorably situated for defence. Around in the near distance rise other less elevated rocks and cliffs, some of them tufted with oaks and beeches, others naked and time-stained, and all together forming a scene of such stern wildness as was well fitted for a hiding-place of liberty, or for its immolation. The experience of the war having already proved that the high towers of stone such as had been built in the highlands up to the time of the death of Khasi-Mollah, were worse than useless as a means of defence against the Russian artillery, inasmuch as their defenders were exposed to be buried under their ruins, Schamyl instructed, it is said, by Polish deserters, now changed entirely the system of his fortifications. To prevent his defences at Akhulgo from being toppled down by the enemy's cannon, he made them to consist mainly of trenches, earthen parapets, and covered ways, while the saklis, which are a kind of hut built of loose stones, partly underground, were also converted into regular casements. These various fortifications, arranged with much skill, commanded all the approaches to the fortress, and everywhere exposed an attacking enemy to a great number of cross-fires. The rifle would indeed have to serve instead of cannon; but in the hands of the Circassian, though not discharged very rapidly inasmuch as it is cleaned after every shot, it was a weapon the Russians had good cause to dread.