'Mounted' in the Bible

The number of mounted troops was 200 million; I heard their number.

The armies in Heaven followed Him--mounted on white horses and clothed in fine linen, white and spotless.

Then I saw the beast and the kings and political leaders of the earth with their armies gathered to make war against Him who is mounted on the [white] horse and against His army.

And the rest were killed with the sword which came from the mouth of Him who sat on the horse, and all the birds fed ravenously and gorged themselves with their flesh.