The city of Trois-Rivières was previously represented in Minor League Baseball by the Trois-Rivières Royals in the Provincial League and the Canadian–American League off-and-on from 1939 to 1955. The Eagles were created as an expansion team of the Double-A Eastern League in 1971, along with the Québec Carnavals, as the league grew from six teams to eight. They played their home games at Stade Municipal de Trois-Rivières. The Cincinnati Reds moved their Double-A affiliation to Trois-Rivières from the Southern League's Asheville Tourists. During their seven-year partnership, the Eagles were supplied with multiple future major leaguers by the Reds, then one of the premier powers in baseball known as the "Big Red Machine". The Eagles' first club, managed by Jim Snyder, won the 1971 National Division title with a 78–59 record before falling to the Elmira Royals, 3–1, in the playoffs. Snyder was recognized as the Eastern League Manager of the Year and outfielderGene Locklear was selected for the Eastern League Most Valuable Player Award. The team led the league in attendance with 109,436 people in their inaugural season. They captured a second division title in 1972, but again fell in the postseason, this time 3–0 to the West Haven Yankees. They had the second-highest attendance behind Québec. The 1973 team finished in third place at 67–72, games out of first, but still drew the second-highest attendance in the league. The 1974 Eagles finished fourth in the division with a 65–73 record, but had the highest attendance. In 1975, Ron Plaza replaced Snyder as manager during the season. The team set a franchise-low 57–80 mark, 27 games out of first. Attendance suffered as well, as they dropped to fourth. New manager Roy Majtyka led the Eagles to win the 1976 Northern Division title, but they were swept 3–0 by West Haven in the playoffs. Majtyka was the league's Manager of the Year. Their attendance was a third-best 62,655. Chuck Goggin managed the 1977 club to win the Canadian-American Division title with a 76–62 record in their final year. As in the previous postseason, West Haven defeated them in the championship playoffs, 3–0. First basemanHarry Spilman won the Eastern League MVP Award. The Eagles' attendance had dropped to a seventh-place 52,927. In 1978, the Eastern League shed both the Eagles and the renamed Québec Métros as it shrank back to six teams. The Reds moved their Double-A affiliation back to the Southern League, partnering with the expansion Nashville Sounds. The city of Trois-Rivières was later represented by the Aigles de Trois-Rivières, a summer amateur-league team in the Ligue de Baseball Élite du Québec and the Trois-Rivières Aigles of the independent Frontier League.
