|Book(s)|| A Clash of Kings (mentioned)|
A Storm of Swords (appendix)
A Clash of Kings
Cadwyl participates in the skirmishes along the Stony Shore led by Theon Greyjoy. He is later one of the warriors chosen by Theon to capture Winterfell. After Theon displayed the heads of the boys above the gate and Farlen attacks him, Cadwyl and Urzen beat him senseless with the butts of their spears.