'Enemy' in the Bible

When thy people Israel are smitten down before the enemy, because they have sinned against thee; if they turn again to thee, and confess thy name, and pray and make supplication unto thee in this house:

If there be in the land famine, if there be pestilence, if there be blasting or mildew, locust or caterpillar; if their enemy besiege them in the land of their cities; whatsoever plague, whatsoever sickness there be;

If thy people go out to battle against their enemy, by whatsoever way thou shalt send them, and they pray unto Jehovah toward the city which thou hast chosen, and toward the house which I have built for thy name;

If they sin against thee (for there is no man that sinneth not), and thou be angry with them, and deliver them to the enemy, so that they carry them away captive unto the land of the enemy, far off or near;

And Ahab said to Elijah, Hast thou found me, O mine enemy? And he answered, I have found thee, because thou hast sold thyself to do that which is evil in the sight of Jehovah.