 1980 saw Arsenal lose two finals in quick succession, defeated by West Ham United in the FA Cup final and then to Valencia in the Cup Winners' Cup on penalties.The club won their first League Cup in 1987, but a year later failed to retain the trophy as outsiders Luton Town beat them in the final.In 1989, Arsenal won their first league championship in 18 years, courtesy of Michael Thomas' last-minute goal against closest challengers Liverpool in the final game of the season.