A fantastic film! The majority of the movie was about learning the culture of a different species. The Native American influence in the culture was very clear along with the environmental message as Aimee posted. The battle scene was no more intense than most other films. It was pretty sad though to see all those people fighting a superior species for their land - oh, hey, just like the Native Americans did!
Again, a wonderful film! I agree though, if you are very strict about what your kids see, check out the movie on the web first and decide. I tend to have a very wide taste in movies and because of my exposure, tend to downplay without realizing it.