The author reacts to correspondence discovered and published by Gábor Kármán in Acta Comeniana 18 (XLII). Most of the letters date from the critical period before the outbreak of the war between Sweden and Poland in 1655, two more from 1656. Comenius, under the pseudonym Ulrich Neufeld, addresses his letters to the commander of the Swedish garrison in Sczecin, Lilienström, who then informs King Charles Gustav of news gained from Comenius and Václav Sadovský. The article sets the texts in their period context and draws attention to the role played by the administrator of Leszno J. G. Schlichting, who dispatched Comenius to the Swedish camp and influenced the writing of Comenius’s Panegyricus Carlo Gustavo. The author agrees with the editor of the letters that the information given by the Czech émigrés about the situation in Greater Poland and Royal Prussia to the Swedes corresponded essentially to the facts, but it was not unknown nor even very important.