While Louis's armies were fighting in Poland and against the Tatars, Louis marched to Croatia in June 1345 and besieged Knin, the former seat of the late Ivan Nelipac, who had successfully resisted Louis's father, forcing his widow and son to surrender. The Counts of Corbavia and other Croatian noblemen also yielded to him during his stay in Croatia. The citizens of Zadar rebelled against the Republic of Venice and accepted his suzerainty. Louis meanwhile returned to Visegrád. He dispatched Stephen II, Ban of Bosnia, to assist the burghers of Zadar, but the ban did not fight against the Venetians.