The Assault on Nijmegen occurred on the night of 10 August 1589, involving troops of the mercenary Martin Schenck von Nydeggen against the small garrison and some citizens at the city of Nijmegen. Located at the confluence of the Waal and Rhine rivers, Nijmegen was strategically important to the defense of the Dutch provinces and the Electorate of Cologne. Planning to take the city by surprise, Schenck and his troops would then reinforce the city, provision it and prepare it for siege by troops of Alexander Farnese, Duke of Parma.