occasions and at many important events since the outbreak of the Dutch Revolt in 1568, such as the siege of Haarlem in 1573 and the ceremonial entry of the Prince of Orange into Brussels on 18 September 1578. It has been claimed that during the gruesome torture of Balthasar Gérard (the assassin of William of Orange) in 1584, the song was sung by the guards who sought to overpower Gérard's screams when boiling pigs' fat was poured over him. Gérard allegedly responded "Sing! Dutch sinners! Sing! But know that soon I shall be sung of!". Another legend claims that following the Navigation Act 1651 (an ordinance by Oliver Cromwell requiring all foreign fleets in the North Sea or the Channel to dip their flag in salute) the "Wilhelmus" was sung (or rather, shouted) by the sailors on the Dutch flagship Brederode in response to the first warning shot fired by an English fleet under Robert Blake, when their captain Maarten Tromp refused to lower his flag. At the end of the song, which coincided with the third and last English warning shot, Tromp fired a full broadside, thereby beginning the Battle of Goodwin Sands and the First Anglo-Dutch War. During the Dutch Golden Age, it was conceived essentially as the anthem of the House of Orange-Nassau and its supporters – which meant, in the politics of the time, the anthem of a specific political faction which was involved in a prolonged struggle with opposing factions (which sometimes became violent, verging on civil war). Therefore, the fortunes of the song paralleled those of the Orangist faction. Trumpets played the "Wilhelmus" when Prince Maurits visited Breda, and again when he was received in state in Amsterdam in May 1618. When William V arrived in Schoonhoven in 1787, after the authority of the stadholders had been restored, the church bells are said to have played the "Wilhelmus" continuously. After the Batavian Revolution, inspired by the French Revolution, it had come to be called the "Princes' March" as it was banned during the rule of the Patriots, who did not support the House of Orange-Nassau. However, at the foundation of the Kingdom of the Netherlands in 1813, the "Wilhelmus" had fallen out of favour. Having become monarchs with a claim to represent the entire nation and stand above factions, the House of Orange decided to break with the song which served them as heads