But if they say thus, Come up to us; then we will go up; for Yahweh has delivered them into our hand: and this shall be the sign to us.
Half a furrow of land (1 Samuel 14:14) was half a parcel of land that a yolk of oxen could plow in one day. Evidently God assisted Jonathan by sending a mild earthquake to unnerve the Philistines further (1 Samuel 14:15; cf. Deuteronomy 7:23).