These shall ... war with the Lamb - in league with the beast. This is a summary anticipation of Rev 19:19. This shall not be till after they have first executed judgment on the harlot (Rev 17:15, Rev 17:16).
Lord of lords, etc. - anticipating Rev 19:16.
are - not in the Greek. Therefore translate, “And they that are with Him, called chosen, and faithful (shall overcome them, namely, the beast and his allied kings).” These have been with Christ in heaven unseen, but now appear with Him.