sentences:  Those castles were usually destroyed and the Prussians manned just a few castles, notably one in Heilsberg (Lidzbark Warmiński), because they lacked technology to defend the captured castles and organization to provide food and supplies to stationed garrisons.On August 29, 1261 Jacob of Liège, who negotiated the Treaty of Christburg after the first uprising, was elected as Pope Urban IV.He, having an inside scope on events in Prussia, was especially favourable to the Teutonic Knights and issued 22 papal bulls in three years of his papacy calling for reinforcements to the Knights.