Matthew Poole and continuators on Revelation 6:15

15 And the kings of the earth, and the great men, and the rich men, and the chief captains, and the mighty men, and every bond-man, and evey free-man , hid themselves in the dens, and the rocks of the mountains .

A Terror shall fall upon all sorts of Men, high and low.

See Isa. 2.19. and, like Men affrighted, they shall seek for themselves hiding-places, where they can think themselves most secure. See Isa. 2.19.