In the accounts of the battle preserved in National Archives of Sweden, Johan Banér accredits the victory to Field Marshal Leslie. Leslie, in his personal correspondence to the Swedish Chancellor, Axel Oxenstierna, was clearly horrified at the losses sustained by his army and implies that there had been disagreement about the wisdom of Banér's tactics before the battle. A third report, by James King conforms with Leslie's, but also contains additional information. All three have been transcribed, translated and published in English. Wittstock saved the Swedes from losing their last significant field army and not only restored Swedish prestige but also encouraged German protestant princes like Hesse-Kassel and the Guelphs to continue resisting the emperor. The overall political position of Emperor Ferdinand was paradoxically strengthened by the defeat.
George William, Elector of Brandenburg, who had fled to East Prusia because of the Swedish occupation of his ancestral homelands, agreed to negotiate an alliance with the emperor in November. In his weak position, George William did not expect to receive anything from the Swedes. He was in fear of losing his inheritance claim to
Pomerania, a territory the emperor and the Saxon elector could offer the Swedes to obtain peace. Georg William supported the uncontested election of the emperor's son
Ferdinand III as king of the Romans on 22 December 1636. Two months later, Ferdinand III succeeded his late father as emperor. On 22 June 1637, George William promised to reinforce the new emperor with his army, over which General Klitzing took command. Despite financial support by the emperor, Brandenburg never managed to raise more than 11,000 men. ==References==