In the wake of the German victory over Poland in September 1939, Wilhelm's adjutant, General von Dommes, wrote on his behalf to Hitler, stating that the House of Hohenzollern "remained loyal" and noted that nine Prussian Princes (one son and eight grandchildren) were stationed at the front, concluding "because of the special circumstances that require residence in a neutral foreign country, His Majesty must personally decline to make the aforementioned comment. The Emperor has therefore charged me with making a communication." Wilhelm greatly admired the success which Hitler was able to achieve in the opening months of the Second World War, and personally sent a congratulatory telegram when the Netherlands surrendered in May 1940: "My Fuhrer, I congratulate you and hope that under your marvellous leadership the German monarchy will be restored completely." Hitler was reportedly exasperated and bemused, and remarked to Linge, his valet, "What an idiot!". In another telegram to Hitler upon the fall of Paris a month later, Wilhelm stated "Congratulations, you have won using my troops." In a letter to his daughter Victoria Louise, Duchess of Brunswick, he wrote triumphantly, "Thus is the pernicious Entente Cordiale of Uncle Edward VII brought to nought." Nevertheless, after the Nazi conquest of the Netherlands in 1940, the aging Wilhelm retired completely from public life. In May 1940, when Hitler invaded the Netherlands, Wilhelm declined an offer from Churchill of asylum in Britain, preferring to die at Huis Doorn.