John Wesley on 1 Samuel 14:15

Field - That is, in the whole host which was in the field. All - That is, among all the rest of their forces, as well as those in the garrison at Michmash, as the spoilers, mentioned chap.13:17, the report of this prodigy, and with it the terror of God speedily passing from one to another. Trembling - The Hebrew is, a trembling of God, signifying not only a very great trembling, but such as was supernatural, and came immediately from the hand of God. He that made the heart knows how to make it tremble. To complete their confusion, even the earth quaked; it shook under them, and made them fear it was just going to swallow them up. Those who will not fear the eternal God, he can make afraid of a shadow.