[3] The 1946–1947 season was their most successful ever when they were winners of the Essex and Suffolk Border League.

In 1948, Colchester Casuals entered the FA Cup for the first time, losing 3–2 away to Dagenham British Legion in the extra preliminary round.

The following season, the club reached the preliminary round, after beating Saffron Walden Town 3–2, before exiting to the hands of Grays Athletic.

[6] The team at this time contained an array of talent including a young Vic Keeble who went on to play for Newcastle United and they were captained by former Chelsea and Northern Ireland player Cecil Allan.

[7] The club folded in 1970 due to financial problems and difficulties raising a full team.