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In page Battle of Wittstock:

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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.[1] Nevertheless, Wittstock was a resounding victory for the Swedish forces and corrected any delusions harboured by the Imperialists that they were a spent force after the earlier battle of Nördlingen.