Trumpkin the dwarf, despite having no belief whatsoever in Aslan, High King Peter, or Susan's horn, declares that he will take on the errand of going to meet whatever help the horn calls up: "You are my King. I know the difference between giving advice and giving orders. You have my advice and now it's the time for orders."
Peter in Prince Caspian is essentially a series of CMoAs. Re-enter the High King of Narnia, who may be an English schoolboy but also happens to be a brilliant leader, seasoned warrior, excellent strategist and wise counsellor. Lewis gets extra points for showing exactly why Peter is the High King over all kings in Narnia without turning him into a Marty Stu.
Edmund gets some of this too. Read the chapter where he turns up to give the challenge to Miraz. Glozelle and Sopespian notice him going to Miraz's tent and have brief swooning session over his aura of badassitude.
His battle cry deserves a mention as well:
"Narnia! Narnia! THE LION!"
The White Witch tempts Caspian and then Peter with the promise of power, but Edmund get a Moment of Awesome when he stabs her from behind and breaks her spell. Just the whole look on his face, coupled with how he succumbed to her temptations in the first movie but obviously learned something from the experience.
The entire White Witch encounter was only in The Film of the Book. The hag and the Werewolf book only got as far as suggesting raising her - though Peter's and Edmund's Big Damn Heroes moment where they burst in in time to stop the ritual from starting is still pretty Badass.
These are some other CMOAs Edmund got in the Film of the Book:
Throughly smacking down a guard during the assault on the castle with a flashlight.
Falling backwards off the tower to be picked up by a griffin.
And a minor one when he says this to Miraz: "So you're bravely refusing to fight a man half your age?"
The moment right before then. Bonus points for the completely nonchalant delivery.
Miraz:Tell me, Prince Edmund...
Miraz: I beg your pardon?
Edmund: It's King Edmund. Just King. Peter's the High King. I know, it's complicated.
In the final battle he steals a crossbow from a Telmarine soldier and uses it to great effect, when his sibling give hime dirty looks he gives them one of his own that basically amounts to "Deal with it."
His first fight with Trumpkin the dwarf.
Trumpkin:(as Peter draws his sword) Ohhh, you don't want to be doing that, lad.
Peter:(as he hands the sword to Trumpkin) Not me. Him. (indicating Edmund)
Him siding with Lucy about changing their plans and going down the gorge where she saw Aslan, because even though he can't see anything, he owes her one from the first book. And later, Lucy pointing out that they're going to have to go down the gorge after all — without, as Peter points out, saying "I told you so."
The scene where he battles the werewolf and kills it. Then he's the only one who manages to set things right when the White Witch tries to lure Caspian and Peter. He drives his sword through the ice and destroys her, finishing with a true CMOA line towards Peter:I know...you had it sorted.
Don't forget the moment where he resets Peter's dislocated shoulder.
And the fact that he fights with TWO swords during the final battle. Kudos to Skandar Keynes for learning to wield those!
Skandar Keynes actually deserves a mention here as well, since his character got pushed to the background in order to focus almost exclusively on Peter, Susan and Caspian; most of his lines from the book were given to other characters, he has a total of one scene with continuous dialog, and his already minor screentime suffered even more during the editing process. Despite all of this, he still manages to shine in the few moments that he does get, and he's one of the two Pevensie children that did not end up coming across as a jerk for much of the film.
Aslan roars to awaken the dryads (tree nymphs). And not just any roar, one that echos and carries across a huge distance and rolls across the plains like thunder. Done epically well in the radio drama, not so much in the movie.
Susan gets one too, when she manages to take out almost all of a bunch of riders pursuing her and Lucy through the woods. Okay, Caspian has to dispatch the last one, but still...
Don't forget during the castle fight, she shoots a guard with an arrow, then stabs one with another arrow and follows that by throwing it into the chest of another guard.
And let's not forget Peter's defeat of King Miraz:
Miraz: What's the matter boy? Too cowardly to take a life?
Peter: It's not mine to take.
Everything Reepicheep does.
Pattertwig:(enthusiastically) We can gather nuts!
Reepicheep: Yes, and we'll throw them at the Telmarines! (sarcasm washed away) Shut up.
Reepicheep at the end, the voice actor delivering the EXACT LINES that CS Lewis wrote in such a way that it sounded like a typical ramble from one of his comedy routines.
His mice get one when he gets his tail cut off. Lucy heals him, but her cordial can't restore his severed tail. Whereupon the mice draw their swords to cut off their own tails, declaring that they will not retain an honor denied their leader. Which could also double as a Crowning Moment of Heartwarming. Either way, Aslan is so pleased by their devotion that he gives Reepicheep his tail back.
Aslan, the girls and the Old Narnians running around putting Narnia to rights while the battle is being won — the nicest, gentlest Roaring Rampage of Revenge ever (although it works best if you don't apply Fridge Logic to questions such as whether it's really okay to turn small boys into pigs because they've been bratty to their teacher). (Actually, the book doesn't explicitly say that they got turned into pigs; it says that the boys were never seen again, but a bunch of pigs turned up; which could mean anything or nothing.)
The unnamed minotaur who holds up the castle gate, even after being peppered with arrows, so that the Narnian army can retreat, also deserves a mention.
His name is Asterius, btw.
Yes, yes he does. As does the centaur that's stuck on the wrong side of the gate in that scene who sees his father, nods at him, then turns around and rides into the guards attacking the the others stuck behind that gate. They will kill him, but by Aslan, he'll take them down with him.
Lucy gets a Crowning Moment of Awesome near the end. the enemy army is retreating across a bridge from the Narnian army, when Lucy appears at the far end. She draws a small knife. The army stops in its tracks. Then again, there's a lion (which is God) standing right beside her.
The River God. That is all.
And Aslan's roar that summons him. It's so powerful that it stops the Telmarine's in their tracks, and the shot from above emphasizes it as you seen the water under the bridge ripple outward.