I saw in the night - that is, that following on “the twenty-fourth day.” The darkness of the night perhaps was chosen, as agreeing with the dimness of the restored condition. Night too is, Dionysius), “through the silence of the senses and of the fancy, more suited for receiving divine revelations.”
A man riding upon a red horse - The man is an angel of God, appearing in form of man, as Daniel says, “The man Gabriel, whom I had seen in the vision at the beginning, touched me” Daniel 9:21. He is doubtless the same who appeared to Joshua in form of man, preparing thereby for the revelation of God manifest in the flesh - He, before whom Joshua fell on his face and in him worshiped God, through whom also God required the same tokens of reverence as He had from Moses. “Joshua lifted up his eyes, and looked, and behold there stood a man over against him with a sword drawn in his hand, who said, as Captain of the Lord’s host am I come” (Joshua 5:13-15. See the note on “the Angel of the Lord” in Dr. Pusey’s Daniel the Prophet, pp. 519-525). He rides here, as Leader of the host who follow Him; to Him the others report, and He instructs the Angel who instructs the prophet. Red, being the color of blood, symbolizes doubtless “the vengeance of God to be inflicted on the enemies of the Jews for their sins committed against the Jews” (Dionysius), exceeding the measure of chastisement allowed by God. It probably was Michael Daniel 10:13, who is entitled in Daniel, “your prince Daniel 10:21, the great prince which standeth up for the children of thy people” .
And he was standing - Almost as we say, stationary, abiding in that one place. The description is repeated Zechariah 1:10 apparently as identifying this angel, and so he and the “angel of the Zechariah 1:11 Lord” are probably one.
The myrtle trees - from their fragrance and lowness, probably symbolize the Church, as at once yielding a sweet odor, and in a low estate, or lowly. The natural habits of the myrtle make it the fitter symbol.
And behind him - The relation of the Angel as their chief is represented by their following him. This is consistent with their appearing subsequently as giving report to him. The red and white horses are well-known symbols of war and glory, whence He who sits on “the white horse” Revelation 6:2 in the revelations, “went forth conquering and to conquer.” The remaining color is somewhat uncertain. If it be ashen gray, it would correspond to the pale horse of the revelations, and the union of the two colors, black and white, is calculated to be a symbol of a chequered state of things, whereas a mingled color like “chestnut” is not suggestive of any symbol.