During the Eighty Years' War between the Netherlands and Spain, the Capture of Brielle on April 1, 1572, by Protestant rebels, the Watergeuzen, marked a turning point in the conflict, as many towns in Holland then began to support William of Orange against the Spanish Duke Fernando Álvarez de Toledo, 3rd Duke of Alba who was sent to pacify The Netherlands. This event is still celebrated each year on April 1 and the night before (known as Chalk Night (kalknacht) when the city is defaced with chalk - and now also white paint). Dutch students are taught a short rhyme to remember this fact, which rhyme refers to April Fools' Day: