Question: What decade old football team beat Old Etonians in the Football Association Callenge Cup that marked the turning point in the sport from upper-class gentleman to a professional sport?
Sentence (from "Blackburn Olympic F.C."): Although the club was only in existence for just over a decade, it is significant in the history of football in England as the first club from the north of the country and the first from a working-class background to win the country's leading competition, the Football Association Challenge Cup (FA Cup).
Relevant evidence: Yes