Kulmerland
The Prussians launched raids against the Chełmno Land (Kumerland), where the Knights first established themselves in the late 1220s. The apparent aim of these raids were to force the Knights to devote as many troops in defense of Chełmno as possible so that they could not provide help to the besieged castles and forts. In 1263 the Natangians led by Herkus Monte raided Chełmno Land and took many prisoners. Master Helmrich von Rechenberg, who was at Chełmno at the time, collected his men and pursued the Natangians, who could not move quickly due to a large number of captives.