At length, the Elector, having formed a junction with the Imperial General Hatzfeld, advanced against Magdeburg, which Banner in vain hastened to relieve. The united army of the Imperialists and the Saxons now spread itself over Brandenburg, wrested several places from the Swedes, and almost drove them to the Baltic. But, contrary to all expectation, Banner, who had been given up as lost, attacked the allies, on the 24th of September, 1636, at Wittstock, where a bloody battle took place. The onset was terrific; and the whole force of the enemy was directed against the right wing of the Swedes, which was led by Banner in person. The contest was long maintained with equal animosity and obstinacy on both sides. There was not a squadron among the Swedes, which did not return ten times to the charge, to be as often repulsed; when at last, Banner was obliged to retire before the superior numbers of the enemy. His left wing sustained the combat until night, and the second line of the Swedes, which had not as yet been engaged, was prepared to renew it the next morning. But the Elector did not wait for a second attack. His army was exhausted by the efforts of the preceding day; and, as the drivers had fled with the horses, his artillery was unserviceable. He accordingly retreated in the night, with Count Hatzfeld, and relinquished the ground to the Swedes. About 5000 of the allies fell upon the field, exclusive of those who were killed in the pursuit, or who fell into the hands of the exasperated peasantry. One hundred and fifty standards and colours, twenty-three pieces of cannon, the whole baggage and silver plate of the Elector, were captured, and more than 2000 men taken prisoners. This brilliant victory, achieved over an enemy far superior in numbers, and in a very advantageous position, restored the Swedes at once to their former reputation; their enemies were discouraged, and their friends inspired with new hopes. Banner instantly followed up this decisive success, and hastily crossing the Elbe, drove the Imperialists before him, through Thuringia and Hesse, into Westphalia. He then returned, and took up his winter quarters in Saxony.