The fifth book written, you're the third book chronologically and take place during The Lion, the Witch and the Wardrobe. You tell the story of the humans Shasta and Aravis and the talking horses Bree and Hwin, all trying to escape from unhappy lives in Calormen to go to Narnia.
Find out which Chronicles of Narnia book you are.
Somehow that doesn't surprise me. That, and The Silver Chair, were always my favorite Narnia books.