chapter 1-how shasta set out on his travels

So at the end of this chapter Shasta discovers that the great lord wants to take him away with him.  Shasta is excited and wonders if his new master will be great and mysteriously the horse over hears him and says he is not.  Astonished, the horse tells shasta all about how he is narnia and  how he wants to be free so him and shasta decide to run away.