There is no doubt that the Ameer, and his friends, calculated that it was already too late in the season for the English to gather a sufficient force, on the frontier, to force the passes held by the Afghan army before the snows. The promptness of action of the English government, the valor of their troops, and the unusually late setting in of the winter combined to overthrow the Ameer's plans. Had the campaign been delayed till the spring, there can be little doubt that the British, in their advance, would have found themselves opposed--if not by a Russian army--at least by an army led and officered by Russians, with Russian engineers and artillerymen. The promptness of their advance, and the capture of the passes and the dispersion of the Afghan armies, within a week of the opening of the campaign, altogether altered this position. Sheer-Ali found himself a king without an army. The plains of Cabul were thronged with the panic-stricken fugitives from the Khyber and Peiwar; and Sheer-Ali started at night from his capital with his Russian friends, and made for the north; sending letter after letter ahead of him to General Kaufmann, imploring the promised aid of Russia. The rapid course of events, however, had entirely disconcerted the Russian plans. In the spring, a Russian army might have advanced and cooperated with that of the Ameer; but the winter had set in, the distance was immense, and the Russians unprepared for instant action. The appeals of the unfortunate prince were responded to with vague generalities. He was no longer a powerful ally, but a broken instrument and, heartbroken with disappointment and failure, the unfortunate Sheer-Ali was seized by fever and died, in an obscure village, almost alone and wholly uncared for. His son Yakoob Khan--who had, in his youth, proved himself a brave and able soldier; but who, having incurred his father's displeasure, had been for years confined as a prisoner at Herat--was now liberated, and took his place as his father's successor. He saw at once that, with a broken and disorganized army, he could not hope to resist the advance of the three British armies which, coming from Jellalabad, from the heights of the Shatur-Gardan, and from Candahar, would simultaneously advance upon his capital, as soon as the snows melted. He therefore opened negotiations and, early in May, himself descended from Cabul and had an interview with General Browne, at Gundamuk; when the preliminaries of peace were arranged, and signed.