Judges 9:39-43

So Gaal went out in the sight of the leaders of Shechem and fought Abimelech.

But Abimelech chased him, and he fled from him; and many fell wounded up to the entrance of the gate.

Then Abimelech stayed in Arumah, but Zebul drove out Gaal and his relatives so that they could not stay in Shechem.

Now it came about the next day, that the people went out to the field, and it was reported to Abimelech.

So he took his people and divided them into three units, and lay in wait in the field; when he looked and saw the people coming out from the city, he attacked them and killed them.