On 3 August 2014, the centenary of Germany's declaration of war on France was marked by French President François Hollande and German President Joachim Gauck, who together laid the first stone of a new joint memorial at Hartmannswillerkopf for French and German soldiers killed in the war. Over 30,000 soldiers from both sides died in the fighting here at the Battle of Hartmannswillerkopf. The site, in the Vosges mountains of Alsace in France, is the location of a cemetery and a crypt containing the ashes of 12,000 unknown soldiers. The presidents observed a minute's silence in the crypt.