Aftermath of the Thirteen Years' War

Timeline

1. 1454Danzig · PrussiaIn February 1454, fifty-three Prussian cities including Danzig formed the Prussian Union, declared independence from the Teutonic Order, and swore allegiance to Casimir IV. Polish forces immediately intervened, the Thirteen Years' War officially began, and Prussia's political order started to dissolve and reorganize.
2. 1454–1455Malbork · PrussiaA Polish-Lithuanian allied army besieged Malbork Castle, the Order's headquarters; though they failed to take it, the Order's prestige was severely damaged. The Order was forced to turn to Bohemia and the Holy Roman Empire for aid, the war entered a prolonged war of attrition, and Prussia's rural economy and trade suffered heavily.
3. 1456–1460Royal Prussia · PrussiaBy the late 1450s, though the war was unfinished, Prussian society had changed profoundly: the urban merchant class rose, the serf economy was devastated by the war, and the Order's finances neared collapse. Poland's control over ports like Danzig strengthened, planting the seeds for the postwar division between Royal Prussia and Teutonic Prussia.