Ultimately, the Teutonic Order did not survive as a dominant force in the region, with their decline markedly accelerating with their defeat at the Battle of Tannenberg. Increasingly pressured by their Polish neighbours with the theatres of continual conflict shifting away from neighbouring lands to within their domain, the financial burden on the Order's subjects was especially taxing. As a consequence, opposition to the Order had begun with the establishment of the Lizard League in 1397, a group which notably retained a Polish element in its allegiances. Similarly, the emergent Prussian Union (Preussischer bund), composed of various dissatisfied local estates, later grew to oppose Teutonic rule. Over the course of 1454 the Union not only withdrew from the rule of the Order but allied themselves with the Poland, offering themselves as subjects. In doing so, the Thirteen Years' War began, resulting in the Teutonic Order's defeat. Thus, Prussia was partitioned, with the western portion being reclaimed by the Polish crown and the east remaining a largely autonomous fief. Yet, as a result, this minor state was forced to abide by Polish laws alongside their own, with local institutions enduring.