The author analyzes the diplomatic sources related to the negotiations between the Teutonic Knights and the Polish-Lithuanian Union after the truce in October 1414. As the compromise was not agreed within the set two-year period, the truce had to be extended, which was eventually done several times until 1421. Negotiations for the extension of the truce were quite tough. The King of Poland used the threat of non-renewal of the truce to put pressure on the Grand Master who was afraid of resuming war against a powerful adversary. Uncertainty surrounding the extension of the truce forced the Grand Master to hire mercenaries every year in the Empire. He also objected to the July deadline (St. Margaret) for the truce set each year, because this month was the most convenient time to begin a war campaign. Nevertheless the Grand Master refused to hand his three villages of Kujawy, which had formed an enclave on Polish territory, over to the King of Poland. Negotiations sometimes took place in several places simultaneously which caused some communication difficulties. The content of the charters extending the truce was drawn a comparison.