Thematic Bible: Of the shechemites against abimelech

Abimelech was prince over Israel three years. And God sent a spirit of hostility between Abimelech and the lords of Shechem; and the lords of Shechem dealt treacherously with Abimelech: that the violence done to the seventy sons of Jerubbaal might come, and that their blood might be laid on Abimelech their brother, who killed them, and on the men of Shechem, who strengthened his hands to kill his brothers. read more.
And the lords of Shechem set an ambush for him on the tops of the mountains, and they robbed all who came along that way by them. And it was told to Abimelech.