What does this fire … from Abimelek refer to? (9:20)

What does this fire … from Abimelek refer to? (Judges 9:20)

King James Version
Judges 9:20
But if not, let fire come out from Abimelech, and devour the men of Shechem, and the house of Millo; and let fire come out from the men of Shechem, and from the house of Millo, and devour Abimelech. 

Judges 9:4 - 5

ESV - ⁴ And they gave him seventy pieces of silver out of the house of Baal-berith with which Abimelech hired worthless and reckless fellows, who followed him. ⁵ And he went to his father's house at Ophrah and killed his brothers the sons of Jerubbaal, seventy men, on one stone. But Jotham the youngest son of Jerubbaal was left, for he hid himself.

Clarify • Share • Report • Asked July 13 2018 • Jack Gutknecht