That's exactly how I read it also.
[ASoS]The majority of the wildling army staying in the forest in a spread out camp while a small amount of them shoot at the wall or try to get through the gate. The ones in the camp are just chillin' and waiting to relieve the ones attacking when they're tired.
As per Cornballer's wish, I won't post in the other thread at all any more.
Spoilers related to above spoilers
yeah only so many people can attack the gates at once. Not to mention that due to a lack of men the Night's watch hasn't been able to cut the forest as far back as needed so forest can cover 95%+ of their army without it being LOL BUDGET like Dany's dragons in their covered cages. If you are referring to the Thens that climbed the wall, that's not even that many men.