Bombing of Belgrade in World War II
{'<entity_0>': 'National Library of Serbia', '<entity_1>': 'Bombing of Belgrade in World War II', '<entity_2>': '1941', '<entity_3>': 'World War II', '<entity_4>': 'Kingdom of Yugoslavia', '<entity_5>': '06 April 1941', '<entity_6>': 'Belgrade', '<entity_7>': 'battle'}
[['Bombing of Belgrade in World War II', 'point in time', '1941'], ['Bombing of Belgrade in World War II', 'part of', 'World War II'], ['Bombing of Belgrade in World War II', 'location', 'Belgrade'], ['Bombing of Belgrade in World War II', 'instance of', 'battle'], ['Bombing of Belgrade in World War II', 'destroyed', 'National Library of Serbia'], ['National Library of Serbia', 'point in time', '06 April 1941'], ['Bombing of Belgrade in World War II', 'location', 'Kingdom of Yugoslavia'], ['Bombing of Belgrade in World War II', 'description', 'battle']]
<entity_1> (German: Unternehmen Strafgericht), also known as Operation Punishment, was the <entity_5> German bombing of <entity_6>, the capital of <entity_4>, in retaliation for the coup d'état that overthrew the government that had signed the Tripartite Pact. The bombing occurred in the first days of the German-led Axis invasion of <entity_4> during <entity_3>. The Royal Yugoslav Army Air Force (VVKJ) had only 77 modern fighter aircraft available to defend <entity_6> against the hundreds of German fighters and bombers that struck in the first wave early on <entity_5>. Three more waves of bombers attacked <entity_6> on <entity_5>, and more attacks followed in subsequent days. Among the non-military targets struck during the bombing were the <entity_0>, which burned to the ground with the loss of hundreds of thousands of books and manuscripts, and the <entity_6> Zoo. On <entity_2>, Adolf Hitler invited Prime Minister Dragiša Cvetković and Foreign Minister Aleksandar Cincar-Marković to Berchtesgaden, and requested that <entity_4> also join the Pact. Hitler decided that <entity_6> would be bombed as punishment for the coup, under the codename <entity_1> (Unternehmen Strafgericht). Also disclosed were the location of <entity_4>'s troop mobilisation centres and air-raid shelters in <entity_6>. Immediately after the first wave, King Peter, the Government of <entity_4> and the Yugoslav Supreme Command left <entity_6> and retreated to <entity_4>'s mountainous interior with the intention of going into exile. One Luftwaffe pilot who claimed his first victory over <entity_6> on <entity_5> was Oberleutnant Gerhard Koall of Jagdgeschwader 54. Other sources state the air <entity_7> over <entity_6> lasted only two days owing to poor flying conditions on 8 April. <entity_6> was occupied on <entity_2>, and four days later, <entity_4> capitulated. It is also the subject of Miodrag Pavlović's poem <entity_6> <entity_2> (Serbo-Croatian: Beograd <entity_2>). A monument commemorating the Yugoslav pilots killed during <entity_1> was inaugurated in New <entity_6> on <entity_5> 1997.
['battle', 'aerial bombing of a city']