Verses 4-16 are essentially parallel to 39.1-10; see there for comments. For this verse, see 39.1.

Built siegeworks against it: See 6.6. This can also be expressed as “cast up a siege-mound against Jerusalem.”

Round about means “all around [the city].”

Quoted with permission from Newman, Barclay M. and Stine, Philip C. A Handbook on Jeremiah. (UBS Helps for Translators). New York: UBS, 2003. For this and other handbooks for translators see here .