which were Italian soldiers) and over 800 people arrested. After the disastrous Battle of Caporetto in 1917, Italian forces were forced far back into Italian territory as far as the Piave river. The humiliation led to the appointment of Vittorio Emanuele Orlando as Prime Minister, who managed to solve some of Italy's wartime problems. Orlando abandoned the previous isolationist approach to the war and increased coordination with the Allies. The convoy system was introduced to fend off submarine attacks and allowed Italy to end food shortages from February 1918 onward. Also, Italy received more raw materials from the Allies. The new Italian chief of staff, Armando Diaz, ordered the Army to defend the Monte Grappa summit, where fortified defences were constructed; despite numerically inferior, the Italians managed to repel the Austro-Hungarian and German Army. 1918 also saw the beginning of the official suppression of enemy aliens. The Italian government increasingly suppressed the Italian socialists. At the Battle of the Piave River, the Italian Army managed to hold off the Austro-Hungarian and German armies. The opposing armies repeatedly failed afterwards in major battles such as Battle of Monte Grappa and the Battle of Vittorio Veneto. After four days, the Italian Army defeated the Austro-Hungarian Army in the latter battle, aided by British and French divisions and the fact that the Imperial-Royal Army started to melt away as news arrived that the constituent regions of the Dual Monarchy had declared independence. Austria-Hungary ended the fighting against Italy with the armistice on 4 November 1918, one week before the 11 November armistice on the Western front. The Italian government was infuriated by the Fourteen Points of Woodrow Wilson, the President of the United States, as advocating national self-determination which meant that Italy would not gain Dalmatia as had been promised in the Treaty of London. In the Parliament of Italy, nationalists condemned Wilson's fourteen points as betraying the Treaty of London, while socialists claimed that Wilson's points were valid and claimed the Treaty of London was an offense to the rights of Slavs, Greeks and Albanians. Negotiations between Italy and the Allies, particularly the new Yugoslav delegation (replacing the Serbian delegation), agreed to a trade off between Italy and the new Kingdom of Yugoslavia, which was that Dalmatia, despite being claimed by Italy, would be accepted as Yugoslav, while Istria, claimed by Yugoslavia, would be accepted as Italian. During the war, the Italian