However, the club then went into a tailspin from which they did not really recover until the 1950s, when they began once again to field competitive sides. During World War II, the club came close to folding, but returned to play after the war emerging as city champions in 1946. In 1951, Duisburg earned promotion to the top-flight Oberliga West with their first-place finish in the 2. Oberliga West. The Oberliga West was the most competitive division of German football at the time, and except for the 1954–55 season, Duisburg would play first division football there right up to the time of the formation of the Bundesliga.