"Wolfpack Prien"@en . . . . "7 submarines" . . . "Prien was a wolfpack of German U-boats that operated during the World War II Battle of the Atlantic from 12 June to 17 June 1940.The group was named after its leader Korvettenkapit\u00E4n G\u00FCnther Prien."@en . "1940Z"^^ . . "0012Z"^^ . .