In 1975, East Bengal broke the record by winning the Calcutta Football League consecutively for the 6th time (1970–75), bettering the record held by Mohammedan Sporting of winning it 5 times (1934–38). In 1975, East Bengal also created history as they defeated their arch-rivals Mohun Bagan by a record margin of 5-0, which is still being held today, in the IFA Shield final at the Mohun Bagan Ground. In 1976, East Bengal made a record of winning the IFA Shield 5 times in a row. In 1978, East Bengal participated in the Federation Cup for the first time and became joint champions with Mohun Bagan.
