Charles Ellicott Commentary Ezra 4:11

"This is the copy of the letter that they sent unto Artaxerxes the king: Thy servants the men beyond the River, and so forth." — Ezra 4:11 (ASV)

On this side the river. —Literally, beyond the river Euphrates, as written for the Persian court.

And at such a time. —Rather, and so forth; meaning, “Your servants, as previously stated,” alluding to the superscription.