After the Second World War Millwall's form was poor and the club dropped into the Third and Fourth Division of the Football League. West Ham have never played below the Second Division in their history and often played a league or two above Millwall. The two sides did not play each other competitively between 13 October 1959 and 7 October 1978, making the 1960s the only decade the teams have not met. Despite the infrequency of their meetings, both sets of supporters still consider the other club their major rival. During these years, the Hammers enjoyed considerable success, winning the FA Cup in 1964, 1975 and 1980. They also won the European Cup Winners' Cup in 1965. Over four decades the sides were only in the same tier of the Football League for three seasons, in 1946–47, 1947–48 and 1978–79. They played two cup games against each other in the Southern Professional Floodlit Cup in 1959 and the Full Members Cup in 1987.