Question: When did Italy enter the war that involved Albert I, of the country where the forest of Hallerbos is found?

full_context: Document 1: Forest of Halatte: The Forest of Halatte (Forêt d'Halatte) in Picardy is one of the largest remaining blocks of natural old growth forest in France. Situated in the département of Oise near Senlis and Pont-Sainte-Maxence, it currently embraces 43 square kilometers. Together with the Forest of Chantilly and the Forest of Ermenonville it forms the "Massif des Trois Forêts". On the north it borders the Forest of Compiègne. The Forest of Halatte is still a source of oak and beech timber.
Document 2: Melsen: Melsen is a village in the province of East-Flanders, Belgium, and is a part of the municipality of Merelbeke. It covers an area of roughly 3 square kilometers. Its terrain is largely made up of one great hill. The northern and southern slopes of the hill, which are fairly steep for the surrounding area (about 20 meters), form the natural boundaries with the bordering villages of Vurste and Schelderode. The eastern slopes of the hill evolve into agricultural land and farther east into the forest of Makkegem. The western slope descends into a marsh that is connected to the Schelde (Scheldt) river.
Document 3: 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 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: 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 6: Belgium: Belgium, officially the Kingdom of Belgium, is a country in Western Europe bordered by France, the Netherlands, Germany and Luxembourg. A small and densely populated country, it covers an area of 30,528 square kilometres (11,787 sq mi) and has a population of more than 11 million. Straddling the cultural boundary between Germanic and Latin Europe, Belgium is home to two main linguistic groups: the Dutch - speaking, mostly Flemish community, which constitutes about 59 percent of the population, and the French - speaking, mostly Walloon population, which comprises about 40 percent of all Belgians. Additionally, there is a small group of German speakers, numbering around one percent, who live in the East Cantons. The capital and largest city is Brussels; other major cities are Antwerp, Ghent, Charleroi and Liège.
Document 7: 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 8: 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 9: Hürtgenwald: Hürtgenwald is a municipality in the district of Düren in the federal state of North Rhine-Westphalia, Germany. It is located in the Eifel hills, approx. 15 km south-west of Düren. Much of the area is covered by forest (Hürtgenwald in literal translation means Hürtgen Forest).
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: 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 12: Hallerbos: The Hallerbos (Dutch for "Halle forest") is a forest in Belgium, covering an area of . It is mostly situated in the municipality of Halle, in Flemish Brabant and has also a little part in Walloon Brabant.
Document 13: 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 14: 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 15: 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.
ground_truth: 1915
sub_queries: Hallerbos >> country Answer: Belgium
Albert I of Belgium >> conflict Answer: the First World War
when did italy enter the First World War Answer: 1915