 They found places living among their co-religionists already established in the Marais.By 1900, about 6,000 had arrived from Rumania, Russia and Austria-Hungary; 18,000 more arrived in the years preceding the First World War.Installed in considerable numbers in the Rue des Écouffes, the Rue Ferdinand Duval (named "Rue des Juifs", "Jews Street", until about 1900), and the Rue des Rosiers, they constituted a new community, the "Pletzl", the "little place" in Yiddish, and they created the "École Israelite du Travail" (Israelite Trade School) at 4B, Rue des Rosiers.