The club in the 1989–90 season finally broke the famed "Gypsy Curse" at Shamrock Park when, after coming so close so many times in the past, the club finally won the Irish League, and in the final match there was a pitch invasion by "Ports" fans, who were acting in disbelief at what had just happened that they had finally done it after coming so painfully close so many times. The following season was without a doubt the best one in the club's history when in the 1990–91 season, the club dominated the Irish League, nearly defeating every team in the division. They retained the title that season and they beat bitter rivals Glenavon in the Irish cup final 2–1 to secure the club's first ever league and cup double. The season after was a disappointing one as players from the first two titles who were in the prime of their careers at the time, had started to age and attendances were starting to fall.