Yarwyck is present for the induction of the new recruits at Castle Black. He calls for the builders after the Lord Commander's speech. He is also present (but does not speak) when the bodies of Othor and Jafer Flowers are returned to Castle Black.
Yarwyck takes part in Lord Commander Mormont's Great Ranging. He is among the officers that takes shelter inside Craster's Keep and is present when Mormont speaks with Craster about Mance Rayder's actions and plans. The Night's Watch are forced to move on when Jon Snow is caught spying on Craster leaving a newborn son in the woods.