What is the meaning of Zechariah 9:14?

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

Then the LORD will appear over them, and His arrow will go forth like lightning. The Lord GOD will sound the ram’s horn and advance in the whirlwinds of the south.

Berean Standard Bible (BSB)

Yahweh will be seen over them; and his arrow will go flash like lightning; and the Lord Yahweh will blow the trumpet, and will go with whirlwinds of the south.

World English Bible (WEB)

And the LORD{H3068} shall be seen{H7200}{(H8735)} over them, and his arrow{H2671} shall go forth{H3318}{(H8804)} as the lightning{H1300}: and the Lord{H136} GOD{H3069} shall blow{H8628}{(H8799)} the trumpet{H7782}, and shall go{H1980}{(H8804)} with whirlwinds{H5591} of the south{H8486}.

Strong's King James

Then יהוה Yahweh will appear over them, His arrow will go out like lightning, אָדוֹן Adonai יהוה Yahweh will blow the shofar, And will march in the storm winds of the south.

The F.O.G*

The F.O.G Paraphrase

And Jehovah doth appear for them, And gone forth as lightning hath His arrow, And the Lord Jehovah with a trumpet bloweth, And He hath gone with whirlwinds of the south.

Young's Literal Translation