The team was based in Lynn, Massachusetts and played their home games at the Manning Bowl.

In 1966 several groups of entrepreneurs were exploring the idea of forming a professional soccer league in United States.

The USA originally planned to start play in the spring of 1968; however the rival National Professional Soccer League, which secured a TV contract from CBS, announced it was ready to launch in 1967.

A disallowed goal by the Cougars due to an offsides call led to an argument with the linesman who was hit in the face by a Detroit player.

[4][5] Shamrock Rovers finished the season in last place of the Eastern Division with a record of 2 wins 3 ties and 7 loses, the worst in the league, and with an average attendance 4,171.