From A Wiki of Ice and Fire
|Book(s)|| A Clash of Kings (mentioned)|
A Storm of Swords (mentioned)
A Feast for Crows (mentioned)
A Dance with Dragons (mentioned)
A Clash of Kings
Ser Lymond was a part of the new Lannister force being formed at Oxcross by Ser Stafford Lannister. He was reported killed in the surprise attack by an army under Robb Stark, which became known as the Battle of Oxcross.