'Line' in the Bible

He defeated Moab, and measured them with a length of rope, making them lie down on the ground; he measured two lengths to [choose those to] put to death, and one full length to [choose those to] be kept alive. And the [surviving] Moabites became servants to David, bringing tribute.

He wrote in the letter, “Put Uriah in the front line of the heaviest fighting and leave him, so that he may be struck down and die.”