Millwall's fortunes fluctuated in the immediate post war years, they were relegated to Division Three South in 1948 and had to apply for re-election to the league in 1950 after finishing in the bottom two. An upswing in fortunes saw Millwall finish 5th, 4th, and then runners up in Division Three South in 1952–53 season; but with only the Champions being promoted, Millwall found themselves stuck in the third tier despite averaging crowds of over 20,000. Millwall then suffered a down swing in fortunes with a number of bottom-half finishes. One highlight of the period was one of the biggest giant-killing upsets in the Fourth Round of the 1956–57 FA Cup on 26 January 1957, when Millwall beat Newcastle United 2–1 in front of a crowd of 45,646.