In my previous entry I touched upon the relationship between Lewenhaupt and Michał Wiśniowiecki. In his memoirs the General frequently underlines his high regard for the Lithuaninan magnate. Lewenhaupt's secretary Klinthen gives a few more details about the relationship in his letters to Olof Hermelin, an official in the Field Chancery. On 5 June 1707 Klinthen writes that there cannot be any doubt about Wiśniowiecki's sincerety, but the Prince is reluctant to transfer his troops to Hetman Sapieha. They are, Klinthen writes, more disciplined than Sapieha's. A month later, after the fall of Bychow, Klinthen states that Wiśniowiecki keeps on assuring the Swedes of his fidelity, but it's prudent to remain skeptical. On 8 Augusti Klinthen writes that the Prince and Oginski seem more interested in fighting with pens than swords, publishing various manifestos against each other.
Source: Riksarkivet (Stockholm), Kanslitjänstemäns koncept och mottagna skrivelser, vol. 80