After five years of regional tournaments during the war, DBU decided to place Slagelse in the newly founded third-tier, the 3rd Division due to the club's performances. In the first ordinary season after the war, Slagelse finished in last place and suffered relegation to the then fourth-tier, the Zealand Series. The club played its first season in the highest Danish football league since World War II in the 1974 Danish 1st Division. Slagelse B&I got relegated the following season, but returned to the top flight in 1978. The 1979 Danish 1st Division once again saw the club relegated, and they spent the following decades in the lower leagues of Danish football. From January 2008 the elite team in the organisation was named FC Vestsjælland and was organised on a professional basis. The team won the 2008–09 Danish 2nd Division East in its first year of competition. It competed in the Danish 1st Division between 2009 and 2013 when, after finishing as runners-up in the 2012–13 season, the team was promoted to the Danish Superliga. They competed at the top level of Danish football for two seasons, being relegated after the 2014–15 season during which they also finished as runners-up in the 2014–15 Danish Cup competition. After the relegation the club went bankrupt in December 2015 and was relegated to the Zealand Series, the fifth tier of Danish football, and began playing as an amateur side under the Slagelse B&I name. Since then they have made their way up to the third division. The fourth tier of Danish football. Achievements Danish Cup: Runners-up (1): 2014–15‡ Zealand Series Winner (7): 1937–38, 1940–41, 1947–48, 1948–49, 1949–50, 1960, 1965 Runners-up (6): 1939–40, 1950–51, 1951–52, 1976‡, 1998, 2016–17 ‡: As FC Vestsjælland‡: Honour achieved by reserve team References External links Official site Football clubs in Denmark Association football clubs established in 1887 1887 establishments in Denmark Slagelse