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?

full_context: Document 1: Darwen F.C.: Darwen Football Club was an association football club from Darwen in Lancashire, North West England. The team, formed in 1870, was an early pioneer of professional football in Northern England, reaching the semi-finals of the 1880–81 FA Cup. They were a Football League member from 1891 to 1899. Darwen joined the Lancashire League in 1900 and remained in regional football afterwards. They last played in the First Division of the North West Counties Football League in 2008–09, when the club was wound-up. A successor team, A.F.C. Darwen, was founded soon after. Darwen played their home games at the Anchor Ground.
Document 2: Blackburn Olympic F.C.: Blackburn Olympic Football Club was an English football club based in Blackburn, Lancashire in the late 19th century. 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). The cup had previously been won only by teams of wealthy amateurs from the Home counties, and Olympic's victory marked a turning point in the sport's transition from a pastime for upper-class gentlemen to a professional sport.
Document 3: 1883 FA Cup Final: The 1883 FA Cup Final was contested by Blackburn Olympic and Old Etonians at the Kennington Oval. Blackburn Olympic won 2–1 after extra time. Jimmy Costley and Arthur Matthews scored for Blackburn; Harry Goodhart for Old Etonians. It was a watershed match for the sport, as for the first time in an FA Cup final a working-class team playing the 'combination game' (passing) were triumphant over a team playing the public school tactics of 'rushing' and 'scrimmages'.
Document 4: 1871–72 FA Cup: The 1871–72 Football Association Challenge Cup was the first staging of the Football Association Challenge Cup, usually known in the modern era as the FA Cup, the oldest association football competition in the world. Fifteen of the association's fifty member clubs entered the first competition, although three withdrew without playing a game. In the final, held at Kennington Oval in London on 16 March 1872, Wanderers beat the Royal Engineers by a single goal, scored by Morton Betts, who was playing under the pseudonym A.H. Chequer.
Document 5: 1876 FA Cup Final: The 1876 FA Cup Final was a football match between Wanderers and Old Etonians on 11 March 1876 at Kennington Oval in London. It was the fifth final of the world's oldest football competition, the Football Association Challenge Cup (known in the modern era as the FA Cup). Wanderers had won the Cup on two previous occasions. The Etonians were playing in their second consecutive final, having lost in the 1875 final. Both teams had conceded only one goal in the four rounds prior to the final. In the semi-finals Wanderers defeated Swifts and the Etonians beat the 1874 FA Cup winners Oxford University.
Document 6: 1882 FA Cup Final: The 1882 FA Cup Final was contested by Old Etonians and Blackburn Rovers at the Kennington Oval. Old Etonians won 1–0, the only goal scored, according to most reports, by William Anderson, although another, questionably, gives Reginald Macaulay. It was the last final to be won by one of the Southern "gentleman amateur" teams who had dominated the first decade of the competition.
Document 7: Barnes Rugby Football Club: Barnes Rugby Football Club, formerly known simply as the Barnes Club, is a rugby union club which is claimed by some sources to be the world's first and oldest club in any code of football. It is claimed that Barnes RFC was founded in as early as 1839 but there is no actual evidence, so the club itself states to have clear documents about its activities from the 1920s. If the claim is true, then Barnes is the world's oldest football club in all codes. The club, from Barnes, London, also played a major role in the early years of association football, and was one of the teams in the first ever game of football. The club currently play in the fifth tier of the English league system, London & South East Premier.
Document 8: 1923 FA Cup Final: The 1923 FA Cup Final was an association football match between Bolton Wanderers and West Ham United on 28 April 1923 at the original Wembley Stadium in London. The showpiece match of English football's primary cup competition, the Football Association Challenge Cup (better known as the FA Cup), it was the first football match to be played at Wembley Stadium. King George V was in attendance to present the trophy to the winning team.
Document 9: History of association football: Association football, more commonly known as football or soccer, can be traced to as far back as the Medieval period in Britain (medieval football). The modern game of association football originates from the formation of The Football Association in London, England in 1863 based on multiple efforts to standardize the varying forms of the game. This allowed clubs to play each other without dispute and which specifically banned handling of the ball (except by goalkeepers) and hacking during open field play. After the fifth meeting of the association a schism emerged between association football and the rules played by the Rugby school, later to be called rugby football. At the time, football clubs had played by their own, individual codes and game-day rules usually had to be agreed upon before a match could commence. For example, the Sheffield Rules that applied to most matches played in the Sheffield area were a different code. Football has been an Olympic sport ever since the second modern Summer Olympic Games in 1900.
Document 10: Arthur Dunn Challenge Cup: The Arthur Dunn Cup is a football cup competition played between the Old Boys of public schools. It started in 1903 and is named in honour of Arthur Dunn who had proposed such a competition but died very suddenly shortly after. Dunn was a leading amateur player of his day and was in the winning Old Etonians side in the 1882 FA Cup Final. It was Dunn who passed the ball to Anderson who scored the only goal to defeat Blackburn Rovers at the Kennington Oval.
Document 11: Football in England: Association football is the national sport in England, where the first modern set of rules for the code were established in 1863, which were a major influence on the development of the modern Laws of the Game. With over 40,000 association football clubs, England has more clubs involved in the code than any other country as well as the world's first club (Sheffield F.C.), the world's oldest professional association football club (Notts County F.C), the oldest national governing body (the Football Association), the first national team, the oldest national knockout competition (the FA Cup) and the oldest national league (the English Football League). Today England's top domestic league, the Premier League, is one of the most popular and richest sports leagues in the world, with six of the ten richest football clubs in the world.
Document 12: 1878 FA Cup Final: The 1878 FA Cup Final was a football match between Wanderers and Royal Engineers on 23 March 1878 at Kennington Oval in London. It was the seventh final of the world's oldest football competition, the Football Association Challenge Cup (known in the modern era as the FA Cup). Wanderers had won the Cup in the previous two seasons and on four previous occasions in total, including the first FA Cup Final, in 1872, in which they defeated the Engineers. The Engineers had also won the Cup, having defeated Old Etonians in the 1875 final.
Document 13: Early grounds of Manchester City F.C.: Before Manchester City Football Club moved into their first permanent home in Manchester, England, in 1887, the club played at a short series of grounds which ranged from established cricket venues to bumpy fields with no stands or boundaries nor history of sporting usage. The club was founded as a philanthropic endeavour to encourage impressionable youths to commit to wholesome activities rather than falling to the local adolescent culture of alcohol and violence. The sport of football was barely 15 years from the writing of its own rulebook. The club had no immediate option of using or constructing a stadium, and thus most of their first locations were nothing more than painted lines and goalposts. As the club reformed and changed its name twice between 1880 and 1887, soits choice of locations were a series of low-cost, short-term solutions when their current location became untenable. In 1887, when City moved to their sixth pitch in only eight years, they had the money, ambition, reputation and stability to construct themselves a more permanent base of operations, at the stadium named Hyde Road.
Document 14: Blackburn Rovers L.F.C.: Blackburn Rovers Ladies Football Club are an English women's football club affiliated with Blackburn Rovers. In 2006 they won the FA Women's Premier League Northern Division and were promoted to the FA Women's Premier League National Division, where they played until relegation in the 2010–11 season. They are currently members of the FA Women's Premier League Northern Division .
Document 15: History of Tottenham Hotspur F.C.: The History of Tottenham Hotspur F.C., an English football club based in Tottenham, London, began in 1882. The club in was formed as Hotspur F.C. by a group of schoolboys, and it was renamed Tottenham Hotspur F.C. in 1884. The club became a professional football club in 1895, and won the FA Cup in 1901 before they joined the Football League, becoming the only non-League club to achieve the feat since the formation of the Football League. Since then, Tottenham have won the FA Cup a further seven times, the Football League twice, the Football League Cup four times, the UEFA Cup twice and also the UEFA Cup Winners' Cup. The Cup Winners' Cup victory in 1963 made Tottenham the first English team to win a UEFA competition. In 1960–61, they were the first team to complete The Double in the 20th century.
ground_truth: Blackburn Olympic Football Club