'Line' in the Bible

Now a man of Benjamin ran from the battle line and came to Shiloh the same day with his clothes torn and dust on his head.

The man said to Eli, “I am the one who came from the battle line. Indeed, I escaped from the battle line today.” And he said, “How did things go, my son?”

Then David left his baggage in the care of the baggage keeper, and ran to the battle line and entered in order to greet his brothers.

Then it happened when the Philistine rose and came and drew near to meet David, that David ran quickly toward the battle line to meet the Philistine.