Forces of Ahmed Hafis Pasha,
Beylerbey of
Vidin, reinforced by troops of
Bosnian Beylerbey Hodaberdi, besieged Petrinja on September 10, 1596. In response, by September 19, 5,000 - 6,000 Christian troops gathered on the left bank of the
Kupa river, under Croatian ban
Ivan Drašković, colonel Juraj Lenković, and Johan Herberstein of the
Military Frontier. Judging their forces too few to cross the Kupa against the Ottoman defenders, they moved towards
Sisak in order to cross the river there and move on to lift the siege of Petrinja. Movement of Croatian troops was interpreted as a retreat by the Ottomans, so the Bosnian beylerbey crossed the river with a cavalry force in order to pursue the enemy. In response, Croatian troops quickly turned back and scattered the pursuers after a short skirmish, forcing them into the Kupa river. == Aftermath ==