England, the Prince wrote a number of letters (known as the Kew Letters) from his new residence in Kew to the governors of the Dutch colonies, instructing them to hand over their colonies to the British as long as France continued to occupy the "mother country". Only a number complied, while those that demurred from doing so became confused and demoralised. Almost all Dutch colonies were eventually captured by the British, who in the end returned most, but not all (South Africa and Ceylon), first at the Treaty of Amiens and later with the Convention of London signed in 1814. In 1799 the Hereditary Prince took an active part in the Anglo-Russian invasion of Holland, engineering the capture of a Batavian naval squadron in the Vlieter Incident. The surrender of the ships (that had been paid for by the Batavian Republic) was formally accepted in the name of William V as stadtholder, who was later allowed to sell them to the Royal Navy (for an appreciable amount). But that was his only success, as the troops suffered from choleric diseases, and civilians at that time were unwilling to re-instate the old regime. The arrogance of the tone in his proclamation, demanding the restoration of the stadtholderate, may not have been helpful, according to Simon Schama. After the Treaty of Amiens in 1802, in which Great Britain recognised the Batavian Republic, an additional Franco-Prussian Convention of 23 May 1802 declared that the House of Orange would be ceded in perpetuity the domains of Dortmund, Weingarten, Fulda and Corvey in lieu of its Dutch estates and revenues (this became the Principality of Nassau-Orange-Fulda). As far as Napoleon was concerned, this cession was conditional on the liquidation of the stadtholderate and other hereditary offices of the Prince. William V, however, had no interest in towns, territories and abbeys confiscated from other rulers, including alternatives as Würzburg and Bamberg, but wanted what was his due: his arrears in salaries and other financial perquisites since 1795, or a lump sum of 4 million guilders. The foreign minister of the Batavian Republic, Maarten van der Goes, was willing to secretly try to persuade the Staatsbewind of the Batavian Republic to grant this additional indemnity, but Napoleon put a stop to it, when he got wind of the affair. The last of the Dutch stadtholders, William V died in exile at his daughter's palace in Brunswick, now