Question

When the stars threw down their spears. these words are an example of

Answer 1

Personification
Personification is when you give an object a human quality 
Here, the stars threw down their spears even though they don't , so the words are an example of personification.

Answer 2

Personification is when you give an object person like actions so the stars can’t actually “throw” their spears but the author has said this to create an effect of tension and anger in the quote