Decembre 1914 : The French occupy Summit 956 for the first time and the Germans suffer their first casualties.
4 to 9 January 1915 : The Germans launch attacks to capture the summit.
19 to 21 January 1915 : The Germans push the French back to the Silberloch.
5 to 26 March 1915 : The French attack and manage to clear the Germans off the summit.
19 to 25 April 1915 : Supported by a heavy artillery bombardment, the Germans counter-attack and recapture the summit. The French capture it once more on 26 April.
9 Septembre 1915 : German raid the French lines with flamethrowers.
15 October 1915 : A major German offensive captures the summit but the French recapture it the following day.
21 December 1915 : A French offensive, supported by a heavy artillery barrage, throws the Germans back on the eastern slopes of the mountain.
22 December 1915 : The Germans call in reinforcements and counter-attack, taking back the positions they held on the 21st.
8 January 1916 : The Germans attack and push the French off the Hirtzenstein position, thereby making the gains made by the French on 21 December redundant.
1917 – 1918 : The Germans carry out several raids with the aim of capturing prisoners.
11 November 1918 : The armistice comes into force and the Germans start evacuating Alsace from 17 November.
1 August 1920 : Inauguration of the Cross of the Haut-Rhin Volunteers.
2 February 1921 : A law classifies the battlefield of Hartmannswillerkopf as a national monument.
3 July 1921 : Inauguration of the monument to the 152nd French Infantry Regiment.
1 October 1922 : Inauguration of the Silberloch National Necropolis.
9 April 1924 : The Hartmannswillerkopf Association is founded in Mulhouse.
9 October 1932 : inInauguration of the National Monument by Albert Lebrun, President of the French Republic.
2009-2013 : Major restauration works are carried out on the National Monument.
3 August 2014 : Start of the Great War Centenary commemorations and laying of the foundation stone of the Franco-German Great War Museum by both François Hollande, President of the French Republic, and Joachim Gauck, President of the Federal Republic of Germany.
3 August 2017 : The Franco-German Great War Historial is open to the public.
10 November 2017 : Inauguration of the Franco-German Great War Historial by Emmanuel Macron, President of the French Republic, and Frank-Walter Steinmeier, President of the Federal Republic of Germany.
10 November 2018 : Re-lighting of the Summit Cross in time for the commemoration of the Centenary of the end of the Great War.