 On the advice of the German prior of the Dominican Order in Gdansk, Władysław I Łokietek decided to bring the Teutonic Order in to help.At first it seemed that all went well, as the knights under Gunther von Schwarzburg, the commander of Chełmno, successfully drove the Brandenburgs from Gdansk and then moved on to Tczew.However the Prussian Grand Master did not listen to Prince Casimir, Władysław's governor residing in Tczew, and without a struggle took the city.