Thematic Bible: Of the shechemites against abimelech

When Abimelech had reigned three years over Israel, God sent an evil spirit between Abimelech and the men of Shechem. The men of Shechem dealt treacherously with Abimelech: That the cruelty done to the seventy sons of Jerubbaal might be avenged on their brother Abimelech. For he killed them and the men of Shechem helped him kill his brother. read more.
And the men of Shechem set men in ambush on the top of the mountains. They robbed all who came along that way. This was reported to Abimelech.