en_tn/jer/04/17.md

They will be like the watchmen of a cultivated field against her all around

Carefully guarding a city to keep people from going in and out is spoken of as if they are carefully watching a field to keep people from stealing from it. Alternate translation: "they will guard Jerusalem carefully like watchmen who carefully guard a cultivated field" (See: rc://en/ta/man/jit/figs-simile)

against her all around

The word "her" refers to Jerusalem. Jerusalem was often spoken of as if it were a woman. (See: rc://en/ta/man/jit/figs-personification)