Behind Enemy Lines - Cards at Cubs: 04/09's experts covering the St. Louis Cardinals and Chicago Cubs, Brian Walton and Steve Holley, square off as the teams they cover prepare to do the same this weekend in a big, four-game series at Wrigley Field, the first matchup between the two rivals in 2009.

On the eve of the big four-game weekend series as the Chicago Cubs welcome the St. Louis Cardinals to the Friendly Confines, Steve Holley, publisher of's Inside the Ivy, and Brian Walton from The Birdhouse, fire a volley of questions and answers back and forth about the two long-standing rivals, coming into the series as the top two teams in the National League Central Division.

In this pair of audio sessions, the two probe the strengths and weaknesses of each club, who's hot and not and discuss what to look for during the upcoming series, to be held in the always-lively atmosphere at Chicago's Wrigley Field Thursday through Sunday.

Brian answers Steve's questions about the Cards: (10:27)

Steve answers Brian's questions about the Cubs: (13:55)

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