The men of the garrison answered Jonathan and his armor bearer, and said, Come up to us, and we will show you a thing. Jonathan said to his armor bearer, Come up after me; for Yahweh has delivered them into the hand of Israel.
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).