For the first part of the verse, see 39.5.
All his army was scattered from him can be expressed as “All his soldiers deserted him and fled in all directions.”
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 .