A great book that I loved in elementary school and still holds up to this day. The first three books in my mind are the best (Mattimeo and Mossflower) and great for children (and adults).
Redwall – https://www.amazon.com/Redwall-Ta…ds=redwall
Mossflower – https://www.amazon.com/gp/product…ype=e
Mattimeo – https://www.amazon.com/gp/product…ype=e