The Petrolia Squires joined the Continental Senior A Hockey League in 1976. In 1979, after two years in the league, the Squires won the Continental Senior "A" title, the OHA Sr. "A" title by beating the Thunder Bay Twins 4-games-to-2, and eventually the Allan Cup. This was the first of four Allan Cups the league would celebrate over the last nine seasons. In 1979, the other Senior "A" league folded and the Cambridge Hornets jumped ship. In their first season in the league together, the Hornets would challenge the Squires in the league final and defeat them in a full seven game battle, 4-games-to-3. The Hornets lost the Allan Cup final. The next year, the two teams met in the final and the Squires won 4-games-to-1 and went on to win their second Allan Cup. In 1982, they met again in the final and the Squires came out on top 4-games-to-3. The Squires lost the Allan Cup final. Then in 1983, the Cambridge Hornets took control, winning the final against Petrolia 4-games-to-3 and won their first Allan Cup since 1971. The fifth and final chapter took place in 1984 as the Cambridge Hornets defeated the Petrolia Squires in the league final 4-games-to-2, but lost in the Allan Cup final.