Verse 3
The third chariot white horses - The empire of the Greeks, founded by Alexander the Great, which destroyed the empire of the Persians.
The fourth chariot grisled and bay horses - That is party-coloured horses, or with horses, some grisled and some bay. The empire of the Romans or of the Greeks. The Greeks divided after the death of Alexander; one part pointing out the Lagidae, who attacked and subdued Egypt; and the other, the seleucidae, who subdued Syria under Seleucus.