After the ceasefire following the Fall of France in June 1940, Alsace was annexed to Germany and a rigorous policy of Germanisation was imposed upon it by the Gauleiter Robert Heinrich Wagner. When, in July 1940, the first evacuees were allowed to return, only residents of Alsatian origin were admitted. The last Jews were deported on 15 July 1940 and the main synagogue, a huge Romanesque revival building that had been a major architectural landmark with its 54-metre-high dome since its completion in 1897, was set ablaze, then razed.