In 1903, the architect Johann Knauth discovered cracks on the first pillar of the northern side of the nave. In 1905 he began taking measures to consolidate and strengthen the north side of the west facade, which supports the spire. After trying several temporary measures, in 1915, during the First World War, he launched a large-scale project to replace the entire foundation of the Cathedral with concrete. This project was completed in 1926, after the end of the war. In 1918 Alsace and Strasbourg and Alscace were once again attached to France.