The First World War was a difficult period: in August 1914, the building was requisitioned by the German army to serve as a stable and dormitory, and it was not until October 1919 that it reopened. The Exposition internationale de Liège, in 1930, is the occasion for the definitive installation of a vast pediment, sculpted on the façade by - set of allegorical figures. In the same year, the city proceeded to remove the façades, which lost their white plaster. The building was spared during the Second World War.