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.
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The Whote Witch killed Aslan on the stone table with a knife made of stone. Then during the battle, (after his ressurection) Aslan kills the White Witch.
Aslan is the lion, who resembles Jesus in the cronicles of narnia.
If you are talking about Chronicles of Narnia the Lion the Witch and the Wardrobe then: He sacrifices himself to save Edmond( he lets the witch kill him) but is later brought back to life. He then take Susan and Lucy to the White Witch's castle and awakens the characters who had been turned to stone. With these reinforcements they go to the battle (where Edmond and Peter are) and he defeats the White Witch. He leaves as the four siblings are crowned.
aslan does save edmund. aslan sacrifices himself but then comes back to life
Azlan Aslan
Aslan brought the stone statues to life by breathing upon the stone.