Roy Keane's Ipswich came from a goal down to book their place in the last eight of the League Cup and end Northampton's superb cup run.
The Cobblers -- who dumped Liverpool out of the previous round -- looked set for another shock when Liam Davis put them ahead early on. But goals from Carlos Edwards and Corkman Damien Delaney soon had the Championship side in front and Keane's men turned in a professional second-half display to seal their progress, with Tamas Priskin adding a late third.
West Brom's impressive form continued as ex-Ireland ace Steven Reid finished off the scoring in their 4-1 win against Leicester.
Former Irish youth international Michael Spillane missed one of the penalties as Brentford lost out 4-3 to Birmingham in a shoot-out. The Blues' Irish captain Stephen Carr converted his spot-kick.