Episode 2-3
Title: "What Is Dead May Never Die"
Directed by Alik Sakharov
Written by Bryan Cogman
Original Air Date -- April 15, 2012
Catelyn Stark arrives at King Renly's camp to negotiate an alliance, and the woman warrior Brienne of Tarth wins the right to join Renly's guard. Tyrion crafts a plan to find who is in Cersei's confidence by proposing three different marriages to the members of the Small Council. At Winterfell, Bran Stark needs help to decipher his dreams. On the road to the wall, the band of Night's Watch recruits are attacked by Lannister soldiers.
Source:
https://en.wikipedia.org/wiki/Game_of_Thrones_(season_2)