Adam Clarke on Matthew 24:27

For as the lightning cometh out of the east, and shineth even unto the west - It is worthy of remark that our Lord, in the most particular manner, points out the very march of the Roman army: they entered into Judea on the East, and carried on their conquest Westward, as if not only the extensiveness of the ruin, but the very route which the army would take, were intended in the comparison of the lightning issuing from the east, and shining to the west.