What is the meaning of Revelation 6:15?

* The two F.O.G. Bibles & Commentary below are currently a work in progress.

Then the kings of the earth, the nobles, the commanders, the rich, the mighty, and every slave and free man hid in the caves and among the rocks of the mountains.

Berean Standard Bible (BSB)

The kings of the earth, the princes, the commanding officers, the rich, the strong, and every slave and free person, hid themselves in the caves and in the rocks of the mountains.

World English Bible (WEB)

And{G2532} the kings{G935} of the earth{G1093}, and{G2532} the great men{G3175}, and{G2532} the rich men{G4145}, and{G2532} the chief captains{G5506}, and{G2532} the mighty men{G1415}, and{G2532} every{G3956} bondman{G1401}, and{G2532} every{G3956} free man{G1658}, hid{G2928}{(G5656)} themselves{G1438} in{G1519} the dens{G4693} and{G2532} in{G1519} the rocks{G4073} of the mountains{G3735};

Strong's King James

(15) And the kings of the land, nobles and the chiliarchs (commanders of 1000's), the rich, the strong, every slave and free hid themselves into the caves and among the rocks of the mountains.

The F.O.G*

[15] Then the kings of earth, the nobles, the military commanders, the rich, the powerful, and everyone else - both slave and free - hid themselves in caves and among mountain rocks.

The F.O.G Paraphrase

and the kings of the earth, and the great men, and the rich, and the chiefs of thousands, and the mighty, and every servant, and every freeman, hid themselves in the dens, and in the rocks of the mountains,

Young's Literal Translation