In 1409, Sigismund signed a treaty with Teutonic Knights which was seen as direct action against Poland and in 1410, Scibor was in charge of the negotiations between Poland and Teutonic Knights on the behalf of Sigismund where Polish side was asked to not attack the Teutonic side. On behalf of Sigismund, Stibor sold Neumark to the Teutonic Knights for a remarkably large sum. This reinforced Sigismund's finances and made it more difficult for the Teutonic Knights to hire mercenaries to fight on their side against the Poles-Lithuanians in Grunwald-Tannenberg.