After 1657, the conflict between Warmia and Ducal Prussia gradually escalated. The disputes concerned fugitive subjects, trade, prices of goods, and the border in the Vistula Lagoon. When the Prince-elector of Brandenburg, Frederick William II, became the King of Prussia, the conflicts intensified, with Brandenburg Prussia acting as provocateurs. The Warmian border areas became the subject of constant military interventions of the Brandenburg army. Tall people were kidnapped and drafted into the army, deserters were pursued. The inhabitants of the area were living in continuous fear. Night watch was unsuccessful. Diplomatic interventions of Polish royal court in Berlin were equally futile. The most notorious event of that time was the raid of Brandenburg troops on the Monastery in Stoczek Klasztorny and the abduction of two monks. The raid was an open military violation of the borders of Warmian dominion. Although the monks were later released by the Prussian authorities, the skirmish increased the fear the Warmian inhabitants had already felt for the Brandenburg soldiers