hartmannswillerkopf or old armand, battlefield and military cemetery of the first world war

1914 1918 alsace armand artillery battle cross crypt dead field first flag france french gallery general graveyard hairy hartmannswiller hartmannswillerkopf haut history hwk memorial memory military monument national necropolis old ossuary peace place rhin serret shelter shelters silberloch soldiers summit symbol trench trenches underground vosges war world