 Part of the battle was shot at Ústí nad Labem in the Czech Republic . Only the entrance to Aslan 's How was built on location . Adamson wanted Peter and Miraz 's duel to feel unique and not like a controlled , overly choreographed fencing match : Moseley and Castellitto began training for the scene in November 2006 . The stunt coordinator Allan Poppleton doubled for Castellitto in some shots because they are similar in size . For claustrophobic shots , cameras were built into their shields . The main camera was placed on a 360 degree track surrounding the ruin it takes place on . The filmmakers dug a large hole in the ground for the scene where the Narnians cause the pillars supporting the growth near Aslan 's How to collapse on the Telmarines . The earth was then restored following completion of the scene . They also had to restore the grass after filming numerous cavalry charges . 18 @,@ 000 fern plants were imported to the Czech Republic to create a forest . A scene shot in Poland , which involved building a cliff face , also had to leave no trace behind . Filming finished by September 8 , 2007 . 
