Question: When did Italy enter the war in which Albert I was king of Peter Delorge's country?

full_context: Document 1: Pedro (footballer, born 1984): Pedro Santa Cecilia García (born 10 March 1984), known simply as Pedro, is a Spanish retired footballer who played as a right midfielder.
Document 2: Queen Elisabeth Medical Foundation: The Queen Elisabeth Medical Foundation (QEMF) is a Belgian non-profit organization, founded in 1926 by Elisabeth of Bavaria, wife of Albert I. She founded the organization, based on her experience with the wounded from the front-line during the First World War. The foundation wants to encourage laboratory research and contacts between researchers and clinical practitioners, with a particular focus on neurosciences. The QEMF supports seventeen university teams throughout Belgium.
Document 3: Kaiser Wilhelm Institute of Anthropology, Human Heredity, and Eugenics: The Kaiser Wilhelm Institute of Anthropology, Human Heredity, and Eugenics was founded in 1927 in Berlin, Germany. When confronted with financial demands, the Rockefeller Foundation supported both the Kaiser Wilhelm Institute of Psychiatry and the Kaiser Wilhelm Institute of Anthropology, Human Heredity and Eugenics. The Rockefeller Foundation partially funded the actual building of the Institute and helped keep the Institute afloat during the Great Depression.
Document 4: Military history of Italy during World War II: However Italy's conquests were always heavily contested, both by various insurgencies (most prominently the Greek resistance and Yugoslav partisans) and Allied military forces, which waged the Battle of the Mediterranean throughout and beyond Italy's participation. Ultimately the Italian empire collapsed after disastrous defeats in the Eastern European and North African campaigns. In July 1943, following the Allied invasion of Sicily, Benito Mussolini was arrested by order of King Victor Emmanuel III, provoking a civil war. Italy's military outside of the peninsula itself collapsed, its occupied and annexed territories falling under German control. Italy surrendered to the Allies at the end of the Italian Campaign.
Document 5: Rogier Meijer: Rogier Meijer (born 5 September 1981 in Doetinchem) is a Dutch former footballer, who played his whole professional career for Dutch side De Graafschap as a midfielder. In May 2014, Meijer announced his retirement from professional football. After a year at his former amateur team VIOD, Meijer completely stopped playing football. He is now working as one of the 3 a.i. coaches of N.E.C. (football club).
Document 6: Military history of Italy during World War II: The participation of Italy in the Second World War was characterized by a complex framework of ideology, politics, and diplomacy, while its military actions were often heavily influenced by external factors. The imperial ambitions of the Fascist regime, which aspired to restore the Roman Empire in North Africa and the Mediterranean (the Mare Nostrum, or the Italian Empire), were partially met with the annexation of Albania and the Province of Ljubljana, and the occupation of British Somaliland and other territories, but ultimately collapsed after defeats in the East and North African campaigns. In July 1943, following the Allied invasion of Sicily, Benito Mussolini was arrested by order of King Victor Emmanuel III, provoking a civil war. Italy surrendered to the Allies at the end of the Italian Campaign. The northern half of the country was occupied by Germans with the fascists help and made a collaborationist puppet state (with more than 600,000 soldiers), while the south was governed by monarchist and liberal forces, which fought for the Allied cause as the Italian Co-Belligerent Army (at its height numbering more than 50,000 men), helped by circa 350,000 partisans of disparate political ideologies that operated all over Italy.
Document 7: Giorgio Gorgone: Giorgio Gorgone (Rome, 18 August 1976) is an Italian player in the role of midfielder, currently campaigning in Triestina. His debut in Serie B season takes place in 1998-1999 with the Lucchese.
Document 8: Triple Alliance (1882): The Triple Alliance was a secret agreement between Germany, Austria - Hungary, and Italy. It was formed on 20 May 1882 and renewed periodically until it expired in 1915 during World War I. Germany and Austria - Hungary had been closely allied since 1879. Italy sought support against France shortly after it lost North African ambitions to the French. Each member promised mutual support in the event of an attack by any other great power. The treaty provided that Germany and Austria - Hungary were to assist Italy if it was attacked by France without provocation. In turn, Italy would assist Germany if attacked by France. In the event of a war between Austria - Hungary and Russia, Italy promised to remain neutral.
Document 9: Delain Sasa: Delain Sasa (born March 9, 1979 in Kinshasa) is a football striker from Congo DR. He currently plays for KS Bylis Ballsh in Albania. He previously played in Germany for Bayer Leverkusen and KFC Uerdingen 05, in Turkey for Erzurumspor, and in Albania for KF Partizani Tirana and Flamurtari.
Document 10: Military history of Italy during World War I: On 3 May 1915 Italy officially revoked the Triple Alliance. In the following days Giolitti and the neutralist majority of the Parliament opposed declaring war, while nationalist crowds demonstrated in public areas for it. (The nationalist poet Gabriele D'Annunzio called this period le radiose giornate di Maggio -- ``the sunny days of May ''). Giolitti had the support of the majority of Italian parliament so on 13 May Salandra offered his resignation to King Victor Emmanuel III, but then Giolitti learned that the London Pact was already signed: fearful of a conflict between the Crown and the Parliament and the consequences on both internal stability and foreign relationships, Giolitti accepted the fait accompli, declined to succeed as prime minister and Salandra's resignation was not accepted. On 23 May, Italy declared war on Austria - Hungary. This was followed by declarations of war on the Ottoman Empire (21 August 1915, following an ultimatum of 3 August), Bulgaria (19 October 1915) and the German Empire (28 August 1916).
Document 11: Peter Delorge: Peter Delorge (born 19 April 1980 in Sint-Truiden, Belgium) is a professional football (soccer) midfielder, who spent his whole career at Sint-Truidense. His position was in the defensive part of the midfield.
Document 12: Kingdom of Italy: In October 1922, Mussolini took advantage of a general strike by workers and announced his demands to the government to give the Fascist Party political power or face a coup. With no immediate response, a small number of Fascists began a long trek across Italy to Rome which was known as the ``March on Rome '', claiming to Italians that Fascists were intending to restore law and order. Mussolini himself did not participate until the very end of the march, with D'Annunzio being hailed as leader of the march until it was learned that he had been pushed out of a window and severely wounded in a failed assassination attempt, depriving him of the possibility of leading an actual coup d'état orchestrated by an organization founded by himself. Under the leadership of Mussolini, the Fascists demanded Prime Minister Luigi Facta's resignation and that Mussolini be named Prime Minister. Although the Italian Army was far better armed than the Fascist paramilitaries, the Italian government under King Vittorio Emmanuele III faced a political crisis. The King was forced to decide which of the two rival movements in Italy would form the new government: Mussolini's Fascists or the anti-royalist Italian Socialist Party, ultimately deciding to endorse the Fascists.
Document 13: Princess Elisabeth, Duchess of Brabant: Princess Elisabeth, Duchess of Brabant (; ; born 25 October 2001), is the heir apparent to the Belgian throne. The eldest child of King Philippe and Queen Mathilde, she acquired her position after her grandfather King Albert II abdicated in favour of her father on 21 July 2013.
Document 14: Yale University: Between 1925 and 1940, philanthropic foundations, especially ones connected with the Rockefellers, contributed about $7 million to support the Yale Institute of Human Relations and the affiliated Yerkes Laboratories of Primate Biology. The money went toward behavioral science research, which was supported by foundation officers who aimed to "improve mankind" under an informal, loosely defined human engineering effort. The behavioral scientists at Yale, led by President James R. Angell and psychobiologist Robert M. Yerkes, tapped into foundation largesse by crafting research programs aimed to investigate, then suggest, ways to control, sexual and social behavior. For example, Yerkes analyzed chimpanzee sexual behavior in hopes of illuminating the evolutionary underpinnings of human development and providing information that could ameliorate dysfunction. Ultimately, the behavioral-science results disappointed foundation officers, who shifted their human-engineering funds toward biological sciences.
Document 15: Eduard Rhein Foundation: The Eduard Rhein Foundation was founded in 1976 in Hamburg (Germany) by Eduard Rhein. The goal of the foundation is to promote scientific research, learning, arts, and culture. This is done in particular by granting awards for outstanding achievements in research an/or development in the areas of radio, television and information technology.
ground_truth: 1915
sub_queries: Of which country is Peter Delorge a citizen? Answer: Belgium
Albert I of Belgium >> conflict Answer: the First World War
when did italy enter the First World War Answer: 1915