In July 1422, the Emperor Sigismund and the Teutonic Knights devoted resources to a war against the Hussites, who attacked and devastated large parts of Germany. The pope called for strong measure to 'get rid of this plague'. Vytautas and Jogaila used the preoccupation with defense against the Hussite raids by attacking Prussia and the Order. Teutonic Grand Master Michael Küchmeister von Sternberg was forced to resign in March. His successor Paul von Rusdorf released most of the hired mercenaries; the Order was left with very few soldiers to defend itself. Joint Polish and Lithuanian forces marched north to Osterode, Teutonic forces retreated to Löbau. When it became clear that siege engines would not arrive, Jogaila ordered an advance towards the Order's fortified capital of Marienburg. His army captured Riesenburg and pillaged surrounding villages. Heading south to Chełmno Land, the Poles and Lithuanians then captured Gollub, but failed to take Schönsee. Jogaila decided to end the war quickly before the overwhelmed Prussian troops of the Order could receive reinforcements from the Holy Roman Empire that Paul von Rusdorf had requested. A truce was signed on September 17, 1422, and the war concluded ten days later with the Treaty of Melno. This ended the territorial disputes and fights between Lithuania and the Teutonic Knights. Poland, however, resumed fighting with the Order once again in 1431–1435 when the Order supported Švitrigaila and not Polish-backed Sigismund Kęstutaitis as the successor of Vytautas.