The two horses pulling the first chariot were red. Black horses pulled the second chariot, white horses the third, and dappled horses the fourth. All of them were strong. These horses evidently represent angels who facilitate the work of other angels, represented by the chariots (cf. Zechariah 6:5). The colors of the horses may symbolize various aspects of judgment, perhaps war and bloodshed in the case of the red horses, famine and death for the black, victory and triumph for the white (cf. Zechariah 1:8; Revelation 19:11; Revelation 19:14), and plague and disease for the dappled (spotted; cf. Revelation 6:1-8). [1][source]