Rockets In Narnia! The Silver Chair Spoilers

Rockets In (or rather under) Narnia! The Silver Chair Spoilers:

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Chapter 14 of "The Silver Chair" (The Bottom Of The World), top of 2nd
page in large paperback (page 643 of "The Chronicles of Narnia"). The
Emerald Queen of the underworld has just been killed. The gnomes are
celebrating like mad. A gnome named Golg tells Eustace, Jill,
Puddleglum, and Prince Rilian "And you can see them over there all
letting off rockets and standing on their heads for joy.". Would the
Emerald Witch have used such rockets in the war to conquer Narnia?