To humiliate Aslan, just like the Romans humiliated and whipped Jesus. The Witch wants to make an example of him and to hurt him. It makes him look less magnificent.
they meet up and go to the battlefield to defeat the white witch
The White Witch is fighting Aslan when Lucy and Susan arrive. She is trying to prevent Aslan from reclaiming his rightful place as the true ruler of Narnia.
The way it has been adapted in the movie shows aslan diving onto the white witch with her flat on the ground. They dont actually show what happens, but it's assumed that he bites her or mauls her - considering he's a lion.
aslan had an agreement with the witch
He breathes on them, which melts the White Witch's curse
Aslan, Susan, and Lucy lead an army to battle against the White Witch at the Battle of Beruna. Aslan ultimately defeats the White Witch and restores peace to Narnia. Afterward, they are crowned as kings and queens of Narnia.
In "The Lion, the Witch, and the Wardrobe" by C.S. Lewis, the White Witch dies when Aslan sacrifices himself to save Edmund. Aslan is resurrected and ultimately defeats the Witch, bringing an end to her reign of tyranny.
I think it is when Aslan, who represents the good, defeated the White Witch in the battle. The battle was between Aslan and the cruel witch to finally bring peace to all in Narnia.
Edmund had broken the White Witch's hold over him by showing compassion and loyalty to his siblings and Aslan. This act of selflessness weakened the witch's power, allowing Aslan's forces to triumph in the battle.
Aslan could breathe life, make people feel braver and stronger, and could heal. The witch would freeze people, manipulate them, and would do them harm. The witch left the land under ice and snow. Aslan made it green and grow.
Aslan comes to the White Witch's castle to offer himself as a sacrifice in place of Edmund, who was set to be killed by the White Witch as payment for his betrayal. Aslan's sacrifice is a key part of the redemption and salvation of Narnia.
The witch in the Narnia kills Aslan on the stone table.