Question: When did Italy enter the conflict that Albert I of the country the 1920 Summer Olympics took place in which the country Trehörningen is located in also participated?

full_context: Document 1: 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 2: Sweden at the 1920 Summer Olympics: Sweden competed at the 1920 Summer Olympics in Antwerp, Belgium. 260 competitors, 247 men and 13 women, took part in 100 events in 18 sports.
Document 3: Switzerland at the 1920 Summer Olympics: Switzerland competed at the 1920 Summer Olympics in Antwerp, Belgium. 77 competitors, all men, took part in 45 events in 13 sports.
Document 4: 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 5: Three-Country Cairn: Three - Country Cairn (Finnish: Kolmen valtakunnan rajapyykki, Northern Sami: Golmma riikka urna, Norwegian: Treriksrøysa, Swedish: Treriksröset) is the point at which the international borders of Sweden, Norway and Finland meet, and the name of the monument that marks the point. It is an example of a geographical feature known as a tripoint.
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: Triangle Lake, Oregon: Triangle Lake is an unincorporated community in Lane County, Oregon, United States. It is about west of Junction City on Oregon Route 36, on the southwest side of the lake of same name. Lake Creek, a tributary of the Siuslaw River, enters and exits the lake. Triangle Lake is closely linked to the unincorporated community of Blachly, on the northeast side of the lake, and the two communities share the K-12 Triangle Lake School, the only school in Blachly School District. Triangle Lake is served by the Blachly post office and the Pioneer Telephone Cooperative.
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: Athletics at the 1920 Summer Olympics: At the 1920 Summer Olympics held in Antwerp, 29 athletics events were contested, all for men only. The competitions were held from August 15, 1920 to August 23, 1920.
Document 10: 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 11: Tullinge: Tullinge is a suburb of Greater Stockholm, Sweden. It is located in the eastern part of Botkyrka Municipality, on the border to the Flemingsberg part of Huddinge Municipality. It had approximately 20,000 inhabitants in 2011.
Document 12: Norway at the 1920 Summer Olympics: Norway competed at the 1920 Summer Olympics in Antwerp, Belgium. 194 competitors, 188 men and 6 women, took part in 72 events in 16 sports.
Document 13: Trehörningen (Sjödalen): Trehörningen (Swedish: "The Triangle") is a small lake located in the municipality Huddinge in southern Stockholm, Sweden. As part of the Tyresån Lake System, Trehörningen receives water from Lake Gömmaren and supplies water to Lake Ågesta.
Document 14: 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.
Document 15: 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).
ground_truth: 1915
sub_queries: Trehörningen >> country Answer: Sweden
Sweden at the 1920 Summer Olympics >> country Answer: Belgium
Albert I of Belgium >> conflict Answer: the First World War
when did italy enter the First World War Answer: 1915