East Tyrol's present-day situation arose from the defeat of the Austro-Hungarian Empire in World War I and its subsequent dissolution. By the 1915 Treaty of London, the Kingdom of Italy, which had joined the victorious Triple Entente, was to obtain the Tyrolean lands south of the Brenner Pass as claimed by the Italian irredentism movement. In November 1918 the Italian Army occupied all Tyrol with 20,000-22,000 soldiers. Thus under the 1919 Treaty of Saint-Germain-en-Laye, the rump state of German Austria had to cede to Italy the southern part of the former crown land of the Princely County of Tyrol, i.e. the present-day provinces of Trentino and South Tyrol and parts of the Belluno province.