 Another loss was John's successful coercion of Wenceslas of Plock to pay homage to him.And so the Duke of Plock refused to accept the sovereignty of the Polish monarch, and instead was dominated by a stranger.The Teutonic Knights, taking advantage of the fact that Kujawy was not prepared for war, crossed the Vistula and burned and destroyed the bishoprics of Wloclawek, Raciąż, and Przedecz.