A third-tier league under the auspices of the Danish FA was introduced to the nation-wide league structure in 1936, beginning with two divisions of four clubs each in the 1936–37 season. Due to World War II, the league was placed on hiatus for five years until its reintroduction as a single division with 10 clubs in 1945. In the 1966 season, the league was expanded to include two divisions, coinciding with the dissolution of the Kvalifikationsturneringen and the introduction of the new fourth-tier, Danmarksserien. It returned to a single division format in the 1975 season, before once again converting to a two division format in 1986, a single division in 1997 and a two division format in 2005. From 1991 to 1997 the league was played as semi-annual seasons, when the higher ranking leagues switched to an autumn-spring calendar match schedule while the lower ranking leagues continued with spring-autumn tournaments — a revisit to the same calendar schedule that had been played until 1956. In 2015–2020, the league consisted of two stages; a preliminary round split into 2–3 groups with clubs qualifying for either a promotion or relegation round.