The kings and queens of old, as well as Caspian, fight for what is good and true -- despite many acts of betrayal, deceit, and attempted murder. The Telmarines are determined to exterminate the Narnians, whom they regard as inferior and strange, but their point of view is presented as clearly wrong.
Lots of swordfights and battles, some of which get pretty brutal. There's not much gore or blood, but there's tons of hitting, lancing, pushing, screaming, clubbing, and stabbing. Many characters are shot with arrows (not much blood shown). One particular one-on-one duel is quite intense and stretches out for some time, and many of the shots are filmed up close. Most of the main characters (including Peter, Edmund, and Susan) dispatch many of their enemies with swords, arrows, and more. There's also lots of discussion of war strategy, and the "bad" guys seem particularly vicious when talking about how to vanquish the Narnians.
Some mild flirting; a single tender kiss at the end.
"Shut up" and "idiot" are used a few times.