Question: The Invincibles is a label given to a football league team that plays a whole season unbeaten. Arsenal achieved it most recently, but which team did it in 1888-89?

Context articles: Preston North End F.C. league record by opponent
James Trainer
Arsenal F.C. league record by opponent
1987–88 Courage Cornwall League 1
1996–97 Wessex Football League
2013–14 Arsenal F.C. season
The Invincibles (football)
1911 college football season
Crawley and District Football League
Arsenal F.C.

Preston North End Football Club, an English association football club based in the Deepdale area of Preston, Lancashire, was founded in 1880.
 For their first eight years, there was no league football, so matches were arranged on an occasional basis, supplemented by cup competitions organised at both local and national level.
 In 1888, Preston participated in the inaugural Football League.
 They won the first top-flight league title and of the 22 matches they won 18 and drew the other four, therefore they remained undefeated thus being labelled "The Invincibles".
 They were the only team to be known by this nickname for 115 years until Arsenal completed their 2003–04 season without a defeat.
 Since then the club has remained in the Football League although it has competed in its various divisions.
James Trainer (born 7 January 1863, Wrexham - died 5 August 1915, Paddington, Central London, England) was a Welsh association football player of the Victorian era.
 He was named the best goalkeeper of the English Football League several years in a row starting with the initial season of 1888–89, when he was part of the unbeaten Preston North End team nicknamed "The Invincibles".
Arsenal Football Club is an English professional association football club based in Holloway, London.
 The club was formed in Woolwich in 1886 as Royal Arsenal before it was renamed Woolwich Arsenal in 1893.
 They became the first southern member admitted into the Football League in 1893, having spent their first four seasons solely participating in cup tournaments and friendlies.
 The club's name was shortened to Arsenal in 1914, a year after moving to Highbury.
 In spite of finishing fifth in the Second Division in 1915, Arsenal rejoined the First Division at the expense of local rivals Tottenham Hotspur when football resumed after the First World War.
 Since that time, they have not fallen below the first tier of the English football league system and hold the record for the longest uninterrupted period in the top flight.
 The club remained in the Football League until 1992, when its First Division was superseded as English football's top level by the newly formed Premier League, of which they were an inaugural member.
 In 2003–04, Arsenal completed a league season without a single defeat, something achieved only once before in English football, by Preston North End in 1888–89.
The Courage Cornwall League 1 1987–88 was the first full season of rugby union within the ninth tier of the English league system, currently known as Tribute Cornwall League 1.
 Illogan Park finished the league season unbeaten, and as the first champions were promoted to the Courage Cornwall/Devon League for season 1988–89.
 Stithians lost all ten matches, finishing in last place and were relegated to Courage Cornwall League 2, along with St Just who finished one place above them.
The 1996–97 Wessex Football League was the 11th season of the Wessex Football League.
 The league champions for the second time in their history were A.F.C. Lymington, after remaining unbeaten for the whole season.
 There was no promotion to the Southern League, but Petersfield Town finished bottom and were relegated.
The 2013–14 season was Arsenal Football Club's 22nd season in the Premier League and 94th consecutive season in the top flight of English football.
 Arsenal participated in the Premier League, FA Cup, League Cup and the UEFA Champions League, after finishing fourth in the previous Premier League season.
 Despite an opening day 1–3 league defeat at home to Aston Villa, which exacerbated underlying anger at the club's inactivity in the transfer market, Arsenal's league campaign got off to a strong start.
 Early pace-setters in the title race, Arsenal led the table for much of the season, spending more time on top of the league than any other side.
 However, a combination of injuries to key players and heavy defeats away from home against other title challengers saw the Gunners' title ambitions evaporate by late March.
 Nonetheless, Arsenal achieved success in the FA Cup with a dramatic 3–2 win over Hull City in the 2014 Final, ending a nine-year trophy drought.
In English football, "The Invincibles" has been used to refer to the Arsenal team of the 2003–04 season managed by Arsène Wenger, and the Preston North End team of the 1880s managed by William Sudell.
 Preston earned the nickname after completing an entire season undefeated in league and cup competition, while Arsenal were undefeated in the league.
The 1911 NCAA football season was the last one before major reforms were made to the American game in 1912.
 In 1911, touchdowns were worth five points, the field was 110 yards in length, and a team had three downs within which to advance the ball ten yards.
 Although no team finished the season unbeaten "and" untied, the United States Naval Academy (Navy) finished with a record of 6 wins and 3 ties (6-0-3).
 Two of the ties were 0-0 games with the other major unbeaten teams, Penn State (8-0-1) and Princeton (8-0-2).
 Other teams that finished the season unbeaten were Minnesota (6-0-1) and Florida (5-0-1).
 The Helms Athletic Foundation, founded in 1936, declared retroactively that Princeton had been the best team of 1911
The Crawley and District Football League was a football competition in England.
 In its final season, it had three divisions, headed by the Premier Division, with Divisions One and Two below.
 The league members could apply for promotion to the Combined Counties League or the Sussex County Football League.
 After the 2005-06 season, South Park made the jump into the CCL.
 The Crawley & District League Premier Division sat at step 7 (or level 11) of the National League System.
 2008-09 Champions Bletchingley transferred to the Surrey Elite Intermediate League in 2009-10.
 In 2009-10 Merstham Newton went the entire league season unbeaten to become Premier Division Champions for the second time in five years.
Arsenal Football Club is a professional football club based in Highbury, London, England, that plays in the Premier League, the top flight of English football.
 The club has won 13 League titles, a record 13 FA Cups, two League Cups, the League Centenary Trophy, 15 FA Community Shields, one UEFA Cup Winners' Cup and one Inter-Cities Fairs Cup.
 It has won the second-most top flight matches in English football history, and is the only English club to go a 38-match league season unbeaten.