The Siege of Mons of 1572 took place at Mons, capital of the County of Hainaut, Spanish Netherlands (present-day Belgium), between June 23 and September 19, 1572, as part of the Eighty Years' War, the Anglo-Spanish War (1585–1604), and the French Wars of Religion. In the spring of 1572, after the capture of Valenciennes by a Protestant force under Louis of Nassau, the Dutch commander continued with his offensive and took Mons by surprise on 24 May.