Question: What invasion by Hitler started the war used as the subject of the film Sherlock Holmes and the Voice of Terror?
Answer(s):
answer: Battle of Falmouth

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:film.film_subject.films ns:m.02r8kxp . 
?c ns:time.event.includes_event ?x .
?x ns:time.event.start_date ?sk0 .
}
ORDER BY xsd:datetime(?sk0)
LIMIT 1