Editing John William Friso (section)

===Last military actions and Death===
[[File:De fatale oversteek van Johan Willem Friso.jpg|thumb|Depiction of the drowning]]

After Malplaquet the Allies marched on Mons and Friso was tasked with leading all operations at the [[Siege of Mons (1709)|siege]]. In 1710 he led the [[Siege of Douai (1710)|Siege of Douai]] together with the [[Leopold I, Prince of Anhalt-Dessau|Prince of Anhalt-Dessau]]. Dessau commanded the right, while Orange led the left. During the siege, the left side made significantly more progress than the right. Years later, Hertel, the Dutch engineer who had served under Dessau, confessed to Vegelin van Claerbergen that he had sabotaged the right-wing's efforts, as the Prince of Orange had requested him - privately - that the progress be delayed there.{{Sfn|Wijn|1959|p=623}} Later that year he managed to capture [[Saint Vernant]]. The prestige that he acquired from his military service should have favored his eventual elevation as [[stadtholder]] in the remaining five provinces. However, in 1711, when traveling from the front in [[County of Flanders|Flanders]] to meet the King of Prussia in [[The Hague]] in connection with his suit in the succession dispute, he drowned on 14 July when the ferry boat on the Moerdyk was overturned in heavy weather. His son was born six weeks after his death.<ref name=StatePF />