"The armies in heaven were following him on white horses."—Rev. 19:14. - ????????

[Bible Speaks]

"The armies in heaven were following him on white horses."—Rev. 19:14. - 

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This name is directly associated with “the war of the great day of God the Almighty.” The term applies specifically to the condition, or situation, to which “the kings of the entire inhabited earth” are gathered in opposition to Jehovah and his Kingdom by Jesus Christ. In a number of versions it is rendered “Armageddon.” (Re 16:14, 16, AT; KJ; JB; RS; TEV) 

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The Revelation account depicts the combined forces of the kings of the earth as being gathered “to the place [Gr., form of to?pos] that is called in Hebrew Har–Magedon.” (Re 16:16) In the Bible to?pos may refer to a literal location (Mt 14:13,15, 35); to one’s opportunity, or “chance” (Ac 25:16); or to a figurative realm, condition, or situation (Re 12:6, 14). In view of the context, it is to a “place” in the last-mentioned sense that earth’s combined military powers are marching.

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“The war of the great day of God the Almighty” at Har–Magedon was not some past event but is depicted in Revelation as future from the time of John’s vision. The gathering of the kings to Har–Magedon is described as being a result of the pouring out of the sixth of the seven bowls containing the “last” plagues that will bring to a finish the anger of God. (Re 15:1; 16:1, 12) Also, indicating that the war at Har–Magedon is closely associated with Christ’s presence is the warning of his coming as a thief, which is placed between verses 14 and 16 of Revelation chapter 16.

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The global aspect of the war is emphasized in the context. There the opponents of Jehovah are identified as “the kings of the entire inhabited earth,” who are mobilized by “expressions inspired by demons.”—Re 16:14.

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Farther on, John says: “And I saw the wild beast and the kings of the earth and their armies gathered together to wage the war with the one seated on the horse and with his army.” (Re 19:19) This chapter identifies the leader of the heavenly armies, seated on a white horse, as one who is called “Faithful and True” and “The Word of God.” (Re 19:11-13) 

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Therefore, it is Jesus Christ, The Word, who acts as the commander of God’s heavenly armies. (Joh 1:1; Re 3:14) Further showing that Christ leads the heavenly forces is the statement that the earthly forces “battle with the Lamb [who is Jesus Christ (Joh 1:29)], but, because he is Lord of lords and King of kings, the Lamb will conquer them. Also, those called and chosen and faithful with him will do so.”—Re 17:13, 14.

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Since the vision in Revelation chapter 19reveals only armies in heaven as participating in the warfare as supporters of Jesus Christ, The Word of God, it indicates that none of Jehovah’s Christian servants on earth will participate in the fighting. This is in harmony with the words of Jesus Christ at Matthew 26:52 that his disciples not resort to weapons of physical warfare. (Compare Ex 14:13, 14; 2Ch 20:15, 17,22, 23; Ps 2:4-9.) The birds that fly in midheaven will dispose of the bodies of those slaughtered.—Re 19:11-21.

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Har–Magedon  (Armageddon) is thus seen to be a fight, not merely among men, but one in which God’s invisible armies take part. Its coming is certain and it will take place at the time set by Jehovah God, who “is doing according to his own will among the army of the heavens and the inhabitants of the earth.”—Da 4:35; see also Mt 24:36.

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https://wol.jw.org/en/wol/d/r1/lp-e/1200001884?q=rev+19%3A14&p=par#h=3