sentence_pair.en: The song 's lyrics are written from the viewpoint of a British RAF pilot fighting during the Battle of Britain ( 1940 ) , the first military engagement to be fought entirely with aircraft .
sentence_pair.fr: La chanson raconte l' histoire d' un pilote d' avions de la Royal Air Force combattant les forces de la Luftwaffe durant la bataille d' Angleterre en 1940 , la première bataille totalement aérienne .