Victor Hugo, who said "A war between Europeans is a civil war", was an enthusiastic advocate for the creation of the United States of Europe. He expounded his views on the subject in a speech he delivered during the International Peace Congress which took place in Paris in 1849. The Congress, of which Hugo was the President, proved to be an international success, attracting such famous philosophers as Frederic Bastiat, Charles Gilpin, Richard Cobden, and Henry Richard. The conference helped establish Hugo as a prominent public speaker and sparked his international fame, and promoted the idea of the "United States of Europe". On 14 July 1870 he planted the "oak of the United States of Europe" in the garden of Hauteville House where he stayed during his exile on Guernsey from 1856 to 1870. The massacres of Balkan Christians by the Turks in 1876 inspired him to write Pour la Serbie (For Serbia) in his sons' newspaper "Le Rappel". This speech is today considered one of the founding acts of the European ideal.