This means that they went out and fought against them in battle. Alternate translation: "went out into the countryside and fought against Israel" (See: [[rc://en/ta/man/jit/figs-explicit]])
Here "Israel" refers to their soldiers, not all of the Israelites. Alternate translation: "against the Israelite soldiers" (See: [[rc://en/ta/man/jit/figs-synecdoche]])