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In the Telmarine castle, the lords of the council learn that Prince Caspian is gone. Lord Sopespian blames Miraz, but Miraz blames the Narnians and tells the lords to fight them to get Caspian back, though Miraz actually intends to kill Caspian.

The Pevensies save Trumpkin from being drowned by two Telmarines; he quickly realizes that the four children are the Kings and Queens of Old and they continue on together. On the way, Lucy glimpses Aslan and tries to convince the others that she has seen him, but only Edmund believes her.

Nikabrik and Trufflehunter lead Caspian to the Dancing Lawn, where the old Narnians have assembled. Caspian convinces them to help him win his throne so he can return their land. Caspian and the Narnians steal weapons from the Telmarines. They also encounter the Pevensies and Trumpkin; they all journey to Aslan's How, a huge barrow built over the Stone Table. Peter decides they will preemptively attack Miraz's castle. Lucy suggests waiting for Aslan to return, but Peter thinks they have waited long enough.

The Narnians raid Miraz’s castle, but Peter calls a retreat when he realizes they are being overwhelmed by Telmarine soldiers. Peter, Susan, Edmund, Caspian, and half of the Narnians manage to escape, but the rest are slaughtered. When they return to Aslan's How, Peter and Caspian argue about the attack on the castle. Back at the castle, Miraz is crowned King of Narnia.

Nikabrik, with the aid of a hag and a werewolf, tells Caspian that they can help him claim his throne and guarantee Miraz's death. However Nikabrik tricks Caspian and the hag uses black sorcery to summon Jadis, the White Witch. From inside a wall of ice, the White Witch tries to convince Caspian to free her with a drop of blood. Peter, Edmund, Lucy and Trumpkin arrive. Edmund kills the werewolf and Trumpkin stabs Nikabrik just as he is about to kill Lucy. Peter kills the hag and then, seeing Caspian being manipulated by the White Witch, knocks him down and faces the White Witch. She quickly begins convincing Peter to release her. Before he can do anything, Edmund shatters the ice, destroying the White Witch.

As Miraz and his army arrive at Aslan's How, Caspian suggests Peter and Miraz duel one-on-one under the condition of surrender, to buy Lucy and Susan time to find Aslan. Miraz agrees to the duel, not wanting to look like a coward in front of his men. The girls are spotted by Telmarine soldiers, so Susan sends Lucy off alone, remaining behind to face the soldiers. A soldier on a horse runs into her, knocking her down. She is rescued by Caspian and they return to the battle. After a fierce fight, Peter defeats Miraz, but gives his sword to Caspian to finish him off. Caspian spares Miraz's life but says that he will give Narnia back to its people.

Sopespian kills Miraz with one of Susan's arrows and accuses the Narnians of shooting Miraz, leading to a battle between the Telmarines and the Narnians, with the Telmarines gradually winning. Lucy finds Aslan in the woods and he awakens the trees. The battle turns as the trees attack the Telmarines. Lord Sopespian orders retreat to a bridge, where they are confronted by Lucy and Aslan. Aslan summons the river god, who destroys the bridge, killing Sopespian. The battle is won with the surviving Telmarine soldiers surrendering.

Before the Pevensies depart Narnia, Peter and Susan are told by Aslan that they have gained everything they could from their experiences in Narnia and will never return. Caspian invites the Telmarines to remain in Narnia if they will coexist peacefully with the Narnians; but if they wish, they can return to the human world, from whence they originally hailed. Some agree to do so, and Aslan creates a portal for them and the four Pevensies. Susan and Caspian kiss, knowing they will never meet again. The Pevensies return to England, leaving Caspian as King of Narnia.

(wikipedia)