The White Witch has cast a spell over Narnia to make it 'always winter and never Christmas' for the past century. Once the four Pevensie children arrive and 'Aslan is on the move' the Witch's curse begins to break, which we see when Father Christmas arrives to give the children and the Beaver's gifts. Lucy receives a healing potion and a dagger, Susan a bow and arrow and a magic horn that will bring aid when and Peter a sword and shield. Edmund misses out because he's with the Witch at the time.
When they hear him coming, the children think it's the Witch since she also travels via sleigh and reindeer, but instead are given this pleasant surprise.
