What does Judges 9:33 mean?
Abimelech's authority as lord over Shechem and the region (Judges 9:1–6) has been challenged by the same leaders who appointed him (Judges 9:22–25). Their latest tool is a newcomer: a man named Gaal has openly bragged to the city leaders, that if he were in charge, he would remove Abimelech from power by force (Judges 9:26–29).When this happens, Abimelech is away from the city. His officer Zebul hears all about it. He takes the threat with deadly seriousness and sends a messenger to warn Abimelech of a potential uprising. He also sends Abimelech a plan to quickly overcome the challenger (Judges 9:30–32).
Zebul wants Abimelech and his men to hide in the field outside the city's eastern gate by the cover of darkness. When the sun comes up it will shine directly into the eyes of anyone trying to defend the gate from an eastern attack. Abimelech and his men can rush the city to defeat Gaal and whomever else is with him at the gate. This is even more strategic in that the plain outside the gate is surrounded by hills. These would create strategic shadows even as the sun rose—giving even more cover to those charging the city. Zebul will take special advantage of this obscured view (Judges 9:36).