'Mountaintops' in the Bible

The leaders of Shechem set men in ambush against Abimelech on the mountaintops, and they robbed all who passed by them along the road; and it 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, “You are only seeing the shadow of the mountains as if they were men.”