Mountains: Beacons or Ensigns often Raised Upon
Source: TTT
Isaiah 13:2
Raise a banner on a barren hilltop; call aloud to them. Wave your hand, that they may enter the gates of the nobles.
Isaiah 30:17
A thousand will flee at the threat of one; at the threat of five you will all flee, until you are left alone like a pole on a mountaintop, like a banner on a hill.