Operation Wikinger
{'<entity_0>': 'Operation Wikinger', '<entity_1>': '19 February 1940', '<entity_2>': 'Kriegsmarine', '<entity_3>': 'World War II', '<entity_4>': 'North Sea', '<entity_5>': 'Luftwaffe'}
[['Operation Wikinger', 'part of', 'World War II'], ['Operation Wikinger', 'participant', 'Kriegsmarine'], ['Operation Wikinger', 'location', 'North Sea'], ['Operation Wikinger', 'participant', 'Luftwaffe'], ['Operation Wikinger', 'point in time', '19 February 1940']]
<entity_0> (English: "Viking") was a sortie into the <entity_4> by German <entity_3> destroyers (1st Destroyer Flotilla) of the <entity_2>, in <entity_1>. During this operation, poor inter-service communication and cooperation between the <entity_2> and the <entity_5> and inexperience resulted in the loss of two German ships, despite the lack of Allied forces, through friendly fire bombing and German or British mines. On <entity_1>, the <entity_2> had grown suspicious of the activities of British fishing vessels around the Dogger Bank. At about the same time, X. Fliegerkorps of the <entity_5> planned to execute a postponed anti-shipping operation over the <entity_4>, using two squadrons of Heinkel He 111 bombers. The <entity_2> had been denied its own air wing ("Marineflieger") and was dependent upon the <entity_5> for air support, which remained under direct <entity_5> control. The official German investigation showed that there had been inadequate communication between the <entity_5> and the <entity_2>.
['naval battle']