BOP and those who studied at the Gdańsk University of Technology had been expelled from Lwów at the end of WW2. Lechia fared well in its early years in the lower divisions finishing top of their district championships in both the 1946–47 and 1947–48 seasons. For Lechia to be promoted to the top division they needed to win additional qualifying rounds against the other district champions, playing a series of games in playoff games, before a final playoff league with four teams of five being promoted. In the playoffs for the 1946–47 season Lechia finished bottom of the playoff league, being the only team not to advance to the top division. Lechia's fortunes changed the following season however and achieved promotion at the end of the 1947–48 season when they finished top of the promotion playoffs league. First years of top flight football (1949–1954) In 1949 Lechia played in the top flight for the first time (at this time the top division was called the "I liga"). While it was a historic year for the club, and showed the competitiveness of the team in their early years to play in the top division, it was not a season to be enjoyed by Lechia in terms of on field performances, winning only 4 games all season and losing an incredible 15 times out of 22 games, finishing bottom of the league as a result. Due to suffering relegation in their first Ekstraklasa season the club found themselves back in the second tier of Polish football in 1950. Their first year in the II liga was a year of transition and the team initially struggled finishing 6th out of 10 teams, and finding themselves way off the pace for an immediate return to the top division. The league format of the II liga was changed for the 1951 season, where in the previous season the division was split into two groups with both winners being promoted, the 1951 season saw the II liga being split into four groups with the group winners playing each other in a mini playoff league with the top two being promoted to the Ekstraklasa. Lechia won their group which was the most diverse group at the time, playing against teams in Poznań and Wrocław who were both across the country from Gdańsk. The team advanced to the playoff league and came up against OWKS Kraków, Górnik Wałbrzych