Moreover Johanan the son of Kareah, and all the captains of the forces that were in the fields, came to Gedaliah to Mizpah,
In the fields - not in the city, but scattered in the country (Jeremiah 40:7).
Related Commentaries of Jeremiah 40:13
Jeremiah 40:13
13 Moreover Johanan the son of Kareah, and all the captains of the forces that were in the fields, came to Gedaliah to Mizpah,