Abdurrahim, along with other princes, Şehzade Mehmed Abdülhalim, son of Şehzade Selim Süleyman, Şehzade Osman Fuad, son of Şehzade Mehmed Selaheddin, were sent to the Potsdam Military Academy as the guests of Kaiser Wilhelm II, where Şehzade Ömer Faruk, the son of Abdulmejid II, later joined them. The Kaiser had admitted these four princes into the Imperial Guard of Hussars, the personal guard regiment of the Kaiser.[9] Abdürrahim Efendi, who had graduated from the Potsdam Military Academy, served an artillery offcer,[10] between the years 1914–1916,[8] at the court of Kaiser Wilhelm.[1]