The siege of Rheinberg 1586–1590, also known as the capture of Rheinberg of 1590, took place at the strategic Cologne enclave of Rheinberg (present-day North Rhine-Westphalia, Germany), one of the principal crossing-points over the Rhine on the stretch between the Electorate of Cologne and the Dutch border, between 13 August 1586 and 3 February 1590, during the Eighty Years' War, the Cologne War, and the Anglo-Spanish War (1585–1604). After an initial siege in 1586, and a long blocking by the Spanish forces until September 1589, Don Alexander Farnese, Duke of Parma (Spanish: Alejandro Farnesio), commander-in-chief of the Spanish army, sent a substantial force, under Peter Ernst, Count of Mansfeld, to besiege Rheinberg. Despite the efforts by Maarten Schenck van Nydeggen (until his death at