Schenn was a big catalyst for the Flyers on the power-play last season, scoring 17 of his 25 goals with the man-advantage.
"He's got huge character," Armstrong said. "That was one of the things that attracted us to him. I know people that have worked with him with the Flyers - Craig Berube has worked with him - then I also know people that have worked with him in Hockey Canada. One thing that always comes back is he's a team-first guy. We lost a lot of character in another trade today, and I'm not sure we would have (traded Ryan Reaves) without knowing Schenn was coming back."
In 433 career NHL regular season games, Schenn has scored 109 goals and 139 assists (248 points).
Shortly after acquiring Schenn, the Blues also acquired center Oskar Sundqvist and the 31st overall pick in the draft from the Pittsburgh Penguins in exchange for Reaves and the 51st overall pick.