Torrhen's Square is a castle in the North. It lies along the shores of a lake and is the seat of House Tallhart, a vassal house sworn to House Stark of Winterfell. It is protected by stone walls thirty feet high.
Torrhen's Square is located 40 leagues (120 miles) southwest of Winterfell. A new tower at Torrhen's Square was put up in a summer which a Northern lord cites as how previous generations mason were better than the current ones.
Theon Greyjoy is dispatched by his father to raid the fishing villages along the Stony Shore. After consulting with his first mate, Dagmer, Theon decides to mount a daring attack inland on Torrhen's Square. He muses that they will not be able to hold the castle, as Winterfell will send troops to retake it rapidly. Sure enough, word of an attack on Torrhen's Square reaches Winterfell. Fearing it might be a Lannister raid behind the lines, Ser Rodrik Cassel decides to muster 200 men and march to the relief of the castle. Maester Luwin is dubious about sending so many troops given their shortage in manpower, but agrees with the decision.
In the books
In the A Song of Ice and Fire books, Torrhen's Square is the seat of House Tallhart and ruled by the Master of Torrhen's Square, Ser Helman Tallhart.
In the novels, Torrhen's Square is slightly further away from Winterfell, possibly 150-200 miles, as compared to the 120 in the TV series. This may be further evidence of the TV version of Westeros being slightly smaller than the book version, or an error in the distance given by the writers or by the characters.
Theon Greyjoy sends Dagmer to besiege Torrhen's Square as a diversion that will allow him to take Winterfell. The ploy works, Ser Rodrik takes most of Winterfell's garrison and forces Dagmer and his troops to retreat back to Stony Shore. Unfortunately, in the meantime Theon captures the undefended Winterfell. After Rodrik returns to Winterfell and besieges it, Dagmer and his men return to Torrhen's Square and easily take the keep. Currently Dagmer is still there.
While Stannis's host marches to Winterfell, Asha offers Stannis to deliver him Torrhen's Square (though she is uncertain Dagmer and his troops will obey her). He refuses, stating that Torrhen's Square is not worth the mud beneath his heels, and it is Winterfell that matters.
Bear Island · Last Hearth · Karhold · The Dreadfort · Winterfell (Winter town) · Deepwood Motte · Torrhen's Square · Castle Cerwyn · Hornwood · Ramsgate · Widow's Watch · Barrowton · White Harbor · Oldcastle · Moat Cailin · Flint's Finger · Greywater Watch · Rillwater Crossing · Ironrath · Highpoint
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