This defile, one of the most formidable and impenetrable in Asia, as a line of military defence, extends from Jumrood upwards in the direction of Jellalabad, without interval, for the space of twenty-eight miles, throughout twenty-two of which it has hitherto been reckoned impassable for an army, when the inhabitants had determined to oppose them. From Jumrood, where the pass opens on the Peshawar side, to Ali Musjid, the dell is deep and uninterrupted; and the celebrated fort, just named, which stands on an isolated hill, in the narrow, near the middle of the defile, completely commands it. Here it is so sickly that the troops we have endeavoured to keep in the fort have from time to time been nearly all swept away. For about seven miles beyond All Musjid, the ascent is somewhat uniform till it arrives near Lundee Khana, where for a couple of miles it stretches out to the face of a frightful precipice, like the galleries by which the Simplon is traversed.