Lord Vance was slain. The last word we had was that Lord Piper was falling back to join your brother and his other bannermen at Riverrun, with Jaime Lannister on his heels. That's not the worst of it, though. All the time they were battling in the pass, Lord Tywin was bringing a second Lannister army around from the south. It's said to be even larger than Jaime's host.
"Father must have known that, because he sent out some men to oppose them, under the king's own banner. He gave the command to some southron lordling, Lord Erik or Derik or something like that, but Sir Raymun Darry rode with him, and the letter said there were other knights as well, and a force of Father's own guardsmen. Only it was a trap. Lord Derik had no sooner crossed the Red Fork than the Lannisters fell upon him, the king's banner be damned, and Gregor Clegane took them in the rear as they tried to pull back across the Mummer's Ford. This Lord Derik and a few others may have escaped, no one is certain, but Sir Raymun was killed, and most of our men from Winterfell. Lord Tywin has closed off the kingsroad, it's said, and now he's marching north toward Harrenhal, burning as he goes."
Grim and grimmer, thought Catelyn. It was worse than she'd imagined. "You mean to meet him here?" she asked.