From A Wiki of Ice and Fire
The Foamdrinker is a longship captained by Dagmer Cleftjaw, the master-at-arms for House Greyjoy of Pyke. It has a high, carved prow and a cramped aft cabin.
A Clash of Kings
Dagmer and the Foamdrinker are part of the small force under the command of Theon Greyjoy during the harrying of the Stony Shore. Deviating from the plan of his father Balon, King of the Iron Islands, Theon grants six longships to Aeron Greyjoy to continue raiding the shore but keeps the Foamdrinker and the Sea Bitch.
Dagmer threatens Torrhen's Square, but Ser Rodrik Cassel defeats him in the fight at Torrhen's Square. Dagmer's distraction allows Theon to capture Winterfell, however.
A Storm of Swords
After the sack of Winterfell, Dagmer and his men capture Torrhen's Square.
- ↑ George R. R. Martin's A World of Ice and Fire, Dagmer.
- ↑ 2.0 2.1 2.2 A Clash of Kings, Chapter 37, Theon III.
- ↑ 3.0 3.1 A Clash of Kings, Chapter 46, Bran VI.
- ↑ A Clash of Kings, Chapter 56, Theon V.
- ↑ A Storm of Swords, Chapter 76, Jon XI.