During 1904 Cameron and other leading London financiers – including Lord Revelstoke of Baring Bros., Arthur Francis Levita and W. M. Koch of Panmure Gordon (Levita's daughter Enid would later marry Cameron's grandson Ewen Donald Cameron in 1930), Sir Marcus Samuel (later Viscount Bearsted) of Samuel Samuel & Co and Royal Dutch Shell, Sir Carl Meyer, and Otto Kahn – took part in negotiations with the Japanese central banker Takahashi Korekiyo (later Prime Minister of Japan) for the selling of war bonds to finance the Japanese war effort during the Russo-Japanese War.