The surrender of Leipzig, three weeks after the battle, was its brilliant result. The city was obliged to clothe the Swedish troops anew, and to purchase an exemption from plunder, by a contribution of 300,000 rix-dollars, to which all the foreign merchants, who had warehouses in the city, were to furnish their quota. In the middle of winter, Torstensohn advanced against Freyberg, and for several weeks defied the inclemency of the season, hoping by his perseverance to weary out the obstinacy of the besieged. But he found that he was merely sacrificing the lives of his soldiers; and at last, the approach of the imperial general, Piccolomini, compelled him, with his weakened army, to retire. He considered it, however, as equivalent to a victory, to have disturbed the repose of the enemy in their winter quarters, who, by the severity of the weather, sustained a loss of 3000 horses. He now made a movement towards the Oder, as if with the view of reinforcing himself with the garrisons of Pomerania and Silesia; but, with the rapidity of lightning, he again appeared upon the Bohemian frontier, penetrated through that kingdom, and relieved Olmutz in Moravia, which was hard pressed by the Imperialists. His camp at Dobitschau, two miles from Olmutz, commanded the whole of Moravia, on which he levied heavy contributions, and carried his ravages almost to the gates of Vienna. In vain did the Emperor attempt to arm the Hungarian nobility in defence of this province; they appealed to their privileges, and refused to serve beyond the limits of their own country. Thus, the time that should have been spent in active resistance, was lost in fruitless negociation, and the entire province was abandoned to the ravages of the Swedes. While Torstensohn, by his marches and his victories, astonished friend and foe, the armies of the allies had not been inactive in other parts of the empire. The troops of Hesse, under Count Eberstein, and those of Weimar, under Mareschal de Guebriant, had fallen into the Electorate of Cologne, in order to take up their winter quarters there. To get rid of these troublesome guests, the Elector called to his assistance the imperial general Hatzfeldt, and assembled his own troops under General Lamboy. The latter was attacked by the allies in January, 1642, and in a decisive action near Kempen, defeated, with the loss of about 2000 men killed, and about twice as many prisoners. This important victory opened to them the whole Electorate and neighbouring territories, so that the allies were not only enabled to maintain their winter quarters there, but drew from the country large supplies of men and horses.