'Mountaintops' 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.

When Gaal saw the people, he said to Zebul, “Look, people are coming down from the mountaintops!” But Zebul said to him, “The shadows of the mountains look like men to you.”