Charles Ellicott Commentary Ezra 4:10

"and the rest of the nations whom the great and noble Osnappar brought over, and set in the city of Samaria, and in the rest [of the country] beyond the River, and so forth." — Ezra 4:10 (ASV)

Asnapper cannot be Esar-haddon, but was probably his chief officer.

And at such a time. — And so forth.