Verses 9–23
bought
(1) A sign of Jeremiah's faith in his own predictions of the restoration of Judah Jeremiah 32:15 for the field was then occupied by the Babylonian army; and (2) a sign to Judah of that coming restoration.
Verses 24–39
mounts
Or, engines of shot.
Verses 40–44
fear
(See Scofield "Psalms 19:9").