The wildling attack on Castle Black is here. The brothers are few in number, most of them are old or crippled, and the castle is indefensible from the south. But they do have some villagers from Mole's Town to help and they are not going to defend the castle, they are going to defend the wall. Jon's leg is injured but he can shoot arrows pretty well from the top of a tower.
The battle goes better than I expected. It turns out the brothers had a cunning plan to trap the wildlings between fire on the stairs of the wall. Styr the Magnar, who tried to get Jon to kill the old man, dies in the fire.
Jon finds Ygritte dying with an arrow in her. It's not one of his. And so he is spared most of the drama: the whole undercover mission turned out to be a surprisingly straightforward story arc for Jon. He didn't have to kill any of his own people; he didn't have to kill any of his new wildling friends; no-one found out about his wildling girlfriend; there was some suspicion from some brothers that he might be a turncloak but he's proven himself now. The next big drama will either be more wildlings attacking, or else finding out that he is Robb's heir.
