The Germans entering Mont Val?rien, 1871. Franco-Prussian War: The entry of the Prussian troops into the fortress of Mont Val?rien and the hoisting of the German national and imperial flag on Sunday, the 29th January...This fortress, on the hill just outside the Bois de Boulogne, opposite St. Cloud, is well known by sight to everyone who has visited Paris, being a conspicuous and imposing feature in the views looking westward on that side of the city. It has rather a heavy appearance, as though it were overweighted by the huge square barracks on the top of the mound. The French military engineers have been working here a great deal, since the siege began, and Mont Val?rien, with its barracks and outworks, and heavy guns, represents an immense amount of labour. From "Illustrated London News", 1871.