Revelation 19:19

And I saw the Wild Beast, and the kings of the earth, and their armies, all assembled to make war, once for all, against the Rider upon the horse and against His army. And the Wild Beast was captured, and with him the false Prophet

Revelation 16:16

And assemble them they did at the place called in Hebrew 'Har-Magedon.'

Revelation 16:14

For they are the spirits of demons working marvels--spirits that go out to control the kings of the whole earth, to assemble them for the battle which is to take place on the great day of God, the Ruler of all.

Revelation 11:7

"And when they have fully delivered their testimony, the Wild Beast which is to rise out of the bottomless pit will make war upon them and overcome them and kill them.

Revelation 13:1-10

And he took up a position upon the sands of the sea-shore. Then I saw a Wild Beast coming up out of the sea, and he had ten horns and seven heads. On his horns were ten kingly crowns, and inscribed on his heads were names full of blasphemy.

Revelation 14:9

And another, a third angel, followed them, exclaiming in a loud voice, "If any one worships the Wild Beast and his statue, and receives a mark on his forehead or on his hand,

Revelation 17:12-14

"And the ten horns which you have seen are ten kings who have not yet come to the throne, but for a single hour they are to receive authority as kings along with the Wild Beast.

Revelation 18:9

The kings of the earth who have committed fornication with her, and have revelled in luxury, shall weep aloud and lament over her when they see the smoke of her burning,

Revelation 19:11-14

Then I saw a door open in Heaven, and a white horse appeared. Its rider was named "Faithful and True" --being One who in righteousness acts as Judge, and makes war.

Treasury of Scripture Knowledge

Summary

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.

Bible References

I saw

Revelation 13:1
And he took up a position upon the sands of the sea-shore. Then I saw a Wild Beast coming up out of the sea, and he had ten horns and seven heads. On his horns were ten kingly crowns, and inscribed on his heads were names full of blasphemy.
Revelation 14:9
And another, a third angel, followed them, exclaiming in a loud voice, "If any one worships the Wild Beast and his statue, and receives a mark on his forehead or on his hand,
Revelation 16:14
For they are the spirits of demons working marvels--spirits that go out to control the kings of the whole earth, to assemble them for the battle which is to take place on the great day of God, the Ruler of all.
Revelation 17:12
"And the ten horns which you have seen are ten kings who have not yet come to the throne, but for a single hour they are to receive authority as kings along with the Wild Beast.
Revelation 18:9
The kings of the earth who have committed fornication with her, and have revelled in luxury, shall weep aloud and lament over her when they see the smoke of her burning,

Him

Revelation 19:11
Then I saw a door open in Heaven, and a white horse appeared. Its rider was named "Faithful and True" --being One who in righteousness acts as Judge, and makes war.