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The Last Battle
Jill and Eustace are called into Narnia to help King Tirian in his struggle against the false appearance of Aslan, and a Calormene invasion. They first free the king from where he is tied to a tree. Then the three of them steal away to a Narnian supply garrison where they put on Calormene disguises and return to Stable Hill. When they arrive they free Jewel the Unicorn. Then Jill disobeys the king's orders by entering the Stable, but in doing so, she discovers Puzzle the Donkey, the fake Aslan. Jill becomes Puzzle's friend and saves him from execution by Tirian.
During the battle, Jill fights with her bow and arrow and kills several Calormene soldiers while weeping for the now-doomed Narnia (she had previously stated that she hoped Narnia would go on forever). She later goes through the stable door and comes into Aslan's Country along with the others and also becomes one of the Queens (alongside Polly and Lucy) along with Eustace who becomes a King like Digory, Peter, and Edmund.
It is not known for sure whether Jill and Eustace got to Narnia because they were killed in the train crash that took the lives of everyone else or if Aslan simply brought them there by magic.
In the 2010 film The Chronicles of Narnia: The Voyage of the Dawn Treader, Jill Pole is mentioned visiting Eustace at the end, although she is not shown. This did not happen in the book, nor did it happen in the BBC adaptation 21 years earlier.