'Army' in the Bible

After these things I saw a great army of people more than might be numbered, out of every nation and of all tribes and peoples and languages, taking their places before the high seat and before the Lamb, dressed in white robes, and with branches in their hands,

And they had breastplates like iron, and the sound of their wings was as the sound of carriages, like an army of horses rushing to the fight.

And the number of the army of the horsemen were two hundred thousand thousand: and I heard the number of them.

And there came to my ears the voice of a great army, like the sound of waters, and the sound of loud thunders, saying, Praise to the Lord: for the Lord our God, Ruler of all, is King.

And I saw the beast, and the kings of the earth, and their armies, gathered together to make war against him that sat on the horse, and against his army.