In order from oldest to youngest:
Peter
Susan
Edmund
Lucy
The children got back to the wardrobe by walking through the back of the wardrobe where the clothes were hanging, just like they did when they first entered Narnia.
The first child to enter Narnia through the wardrobe, was Lucy Pevensie. But her siblings, Peter, Susan, and Edmund, all went through after her.
Lucy Edmond and Susan and forgot the other 1
In the wardrobe Lucy found a world called Narnia. The world was white until Alsan and the 4 children (Peter, Edmund, Susan and Lucy) save Narnia recovering the beautiful green world Narnia once was.
Lucy Pevensie was 7 or 8 years old when she first entered Narnia. However, Georgie Henley was 9 and 10 years old when she did the first film.
The house had a mysterious wardrobe that served as a portal to the magical land of Narnia when entered. Despite its ordinary appearance, the wardrobe was the key to the children's adventures in the story.
The setting for the Lion the Witch and the Wardrobe is an old manor house in the English country side during World War II, when children were evacuated from the cities. The children in the story go through a wardrobe in an empty room and come out in the fantasy world of Narnia.
They arrive in Narnia through the Wardrobe.
In The Lion, the Witch and the Wardrobe, they entered (with Peter and Susan) from inside the wardrobe. But the entry wasn't there every time. In Prince Caspian, all four children were pulled in by the blowing of Susan's horn from inside Narnia. In The Voyage of the Dawn Treader, they were drawn in (with their cousin Eustace) by looking at the painting of a Narnian ship.
Lucy and Edmond with their cousin Eustase.
In "The Chronicles of Narnia: The Lion, the Witch, and the Wardrobe," the children return to Professor Kirke's house in England after their adventures in Narnia by stepping back through the wardrobe. Once they exit the magical world, they find themselves in the same room where they first entered, with no time having passed in the real world. This seamless transition highlights the timeless nature of Narnia and the distinct separation between the two realms.
Narnia