 In 1635, at the end of the Thirty Years' War, Sillegny was nearly destroyed by the Swedish and the church became a pilgrimage place.From 1871 to 1918 and between 1940 and 1945, when Alsace and Lorraine were annexed by Germany (see Treaty of Frankfurt (1871)), Sillegny became a German town renamed Sillningen situated in the Imperial Province of Elsass-Lothringen.The bombings of 1944 destroyed almost all the village.