Scattering people's bones represents killing them and allowing their bones to remain wherever they have died and not be buried properly. "God will completely destroy whomever will camp against you, and their bones will lie scattered on the ground" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Camping against people represents attacking them. Enemy armies would travel and set up camps to live in temporarily near the people they wanted to attack. Alternate translation: "whomever will attack you" (See: [[rc://en/ta/man/translate/figs-metonymy]])