en_tn_condensed/1ch/20/03.md

He brought out

The word "He" refers to David, but also refers to David's soldiers who helped David do this. (See: rc://en/ta/man/translate/figs-synecdoche)

forced them to work with saws and iron picks and axes

These terms describe difficult manual labor that the defeated people were forced to do.

David required all the cities of the descendants of Ammon

The people are referred to by their city. Alternate translation: "David required the people of all the Ammonite cities" (See: rc://en/ta/man/translate/figs-metonymy)

David and all the people returned to Jerusalem

The phhrase "all the people" refers to David's army. Alternate translation: "David and his army returned to Jerusalem"