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The next day, the initiates take a field trip (yay) to the fence around Chicago (boo).
Tris had another nightmare, this time about Peter torturing her to get her to admit to being Divergent.
They take the train to the fence, with Tris staring at Four's muscles the whole way. Subtle.
The fence around Chicago is guarded by Dauntless with guns, though no one knows what they're keeping out (monsters?) or keeping in (annoying kids?).
In fact, the Dauntless used to patrol the poor factionless part of town, but Abnegation voted them out, saying that the poor needed help, not police. (This sounds like a good time to have a class discussion on, well, class.)
While they're examining the fence, a truck full of Amity farmers comes through. And Robert is on that truck. (Who's Robert? He was a young Abnegation neighbor, which you shouldn't say five times fast.)
Robert seems sad by the fact that so many other Dauntless around Tris are jerks. Oh, and also Tris is entirely black-and-blue. He tells her that she should be happy.
But Tris says that happiness isn't her goal.
After that, Four gives Tris some advice about fighting, which is to attack first.
So in other words, this is just a typical field trip, like the ones you take at school.