Edmund ran the Intelligence arm of Narnia. He *plans*. (not to mention that the costume people have specifically said that they designed his armour to be a ranger's.)

And yep, CS Lewis, this is what happens when you dump a soldier and general of 15 years' experience into a teenager's body. There's just so much he doesn't notice is off about himself because he's utterly focussed on the battle and soldiering itself. and probably surreptitiously training everyone in his regiment up to his mindset by sheer influence.

(also, if you think my Peter is frightening, try bedlambard's)