Wrath of the Lamb in Revelation 6:16
Revelation 6:15-17 (NASB)
15 Then the kings of the earth and the great men and the [a]commanders
and the rich and the strong and every slave and free man hid
themselves in the caves and among the rocks of the mountains; 16 and
they *said to the mountains and to the rocks, “Fall on us and hide us
from the ]presence of Him who sits on the throne, and from the wrath
of the Lamb; 17 for the great day of their wrath has come, and who is
able to stand?”
When Jesus was being led to his death by the Roman soldiers, he announce to the women of Jerusalem:
Luke 23:29-30 (NET Bible)
29 For this is certain: The days are coming when they will say,
‘Blessed are the barren, the wombs that never bore children, and the
breasts that never nursed!’[b] 30 Then they will begin to say to the
mountains, ‘Fall on us!’ and to the hills, ‘Cover us!’
The destruction of Jerusalem by the Romans in 70 C.E. is well documented, (read Wikipedia below) There was no hiding place then for the Jews who remained in Judaea. Wherever they tried to hide in Jerusalem, or even when they fled to the mountaintop citadel of Masada, they were unable to escape the violent expression of God’s judgment.)
With the opening of the sixth seal, the coming of God's wrath something similar will happen to the present wicked human mankind alienated from God. They will not be able to find a hiding place, they will cry to the rocks and to the mountains to hide them but neither the literal rocks and mountains or the symbolic mountain like political and commercial systems will provide them with any help.
Their terror is well described by Jesus:
Matthew 24:30 (NASB)
30 And then the sign of the Son of Man will appear in the sky, and
then all the tribes of the earth will mourn, and they will see the Son
of Man coming on the clouds of the sky with power and great glory.
Footnotes: NET Bible.
Barren:
Luke 23:29 tn Grk “Blessed are the barren, and the wombs that have not borne, and the breasts that have not nursed!”sn Normally barrenness is a sign of judgment, because birth would be seen as a sign of blessing. The reversal of imagery indicates that something was badly wrong.
Mountains fall on us,
Luke 23:30 sn The figure of crying out to the mountains ‘Fall on us!’ (appealing to creation itself to hide them from God’s wrath), means that a time will come when people will feel they are better off dead (Hos 10:8). Luke 23:30 sn An allusion to Hos 10:8 (cf. Rev 6:16).
From Wikipedia.The siege of Jerusalem.
https://en.wikipedia.org/wiki/Siege_of_Jerusalem_(70_CE)#:~:text=The%20siege%20lasted%20for%20about,Temple%2C%20still%20stands%20in%20Rome
Josephus claims that 1.1 million people were killed during the siege, of which a majority were Jewish. Josephus attributes this to the celebration of Passover which he uses as rationale for the vast number of people present among the death toll.[23] Armed rebels, as well as the frail citizens, were put to death. All of Jerusalem's remaining citizens became Roman prisoners. After the Romans killed the armed and elder people, 97,000 were still enslaved