Who is Abimelech, and who is Shechem: Gaal focused on Abimelech’s lineage through his father, Gideon, who was not from Shechem, rather than through his mother (Judges 8:31; 9:2).
serve the men of Hamor: Gaal’s lineage apparently traced back to Hamor, the founder of Shechem (Genesis 33:18–34:31).