'Ambush' in the Bible
The "lords" of Shechem sent out men to ambush him on the mountain tops, and they robbed everyone who came by them along the roads, and this was reported to Abimelech.
So get up at night, take your soldiers with you, and wait in ambush out in the field.
So Abimelech and his entire army got up that night and waited in ambush against Shechem in four separate companies.
Ebed's son Gaal went out and stood in the entrance to the city gate while Abimelech and his army were creeping out of their ambush.
So he took his army, divided it into three separate companies, and laid in ambush out in the field. When Abimelech noticed the people coming out from the city, his army attacked them and killed them.
But the army of Israel told themselves, "Let's draw them away by escaping to the highways from the city." So the entire army of Israel moved from their location and arrayed themselves at Baal-tamer while that part of their army moved from their ambush positions from Maareh-geba.
Then the descendants of Benjamin realized that they had been defeated. The army of Israel pretended to retreat from the army of Benjamin, knowing that they had set some soldiers in ambush near Gibeah.
The soldiers in ambush rushed out to attack Gibeah, deploying in force and executing the entire city with swords.
Meanwhile, the army of Israel had arranged to signal their soldiers who had been hiding in ambush by sending up a cloud of smoke from the city.