He; that is, Jeremiah.

Summoned may be somewhat high-level in English; Good News Translation has “called together” and New American Bible “called.”

Commanders of the forces: See verse 1.

All the people from the least to the greatest: See verse 1 and 6.13.

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 .