User blog comment:Etindel/That did NOT just happen!/@comment-15843945-20130606194856/@comment-9788768-20130610170821

Unless it had already been planned before the Freys sent their proposal weddto Robb and the whole Edmure-Roslin wedding was just an excuse to get Robb, Cat and all the Stark men unarmed and drunk at the same place at the same time.

It was probably originally planned out between Roose and Tywin and they took advantage of Walder Frey. Frey's a brute but I don't see him as a tactician like Roose and Tywin by any means. It wouldn't have taken much for Roose or Tywin or whoever to convince Walder to accept the terms.

What makes me believe this is that the Lannisters haven't seemed to care about the Starks throughout the entire season. They had quite a force before Robb chopped off Rickard Karstark's head, they had a secure base at Riverrun, Roose Bolton had taken Harrenhal and I'm guessing they could still have allied with the Martells. But unlike in the previous two seasons, Tywin seemed to care more about forging new Lannister ties with the Tyrells and the Arryns. Most notably though, he commanded Tyrion to marry Sansa. Why would he do that if he wasn't sure that Robb was going to fail. Surely trying to get him to marry someone like say, Asha Greyjoy would have been more rewarding. But no, Tywin had the Red Wedding all planned out for quite a while.