Question: What person served in the military unit Army of Northern Virginia and fought at the battle of Gettysburg?
Answer(s):
answer: Robert E. Lee

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.01jnm)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.01jnm ns:base.culturalevent.event.entity_involved ?x .
?x ns:military.military_person.service ?c .
?c ns:military.military_service.unit ns:m.0fy70 . 
}