In 1458, during the Thirteen Years' War (1454–66) against the Teutonic Order, there was a call for military recruitment throughout Poland. Every Polish town was bound to put up a number of soldiers, the number of which was a sign of the size and power of a given town. With regard to Konin, it was 15 infantrymen; by comparison, Poznań, the capital of Greater Poland, was bound to put up 60, while Kalisz, nearby Słupca and Kłodawa, and Koło were to provide 30, 20, 20, and 15 men, respectively. These quantities suggest that Konin was still a town of medium size. Notwithstanding, the town continued its development of handicraft trades and enlarged the area of its Starosty District. In 1425, Konin was granted a charter to conduct two fairs each year.