'Enemy' in the Bible

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

If there be famine in the land, if there be pestilence, if there be blight, mildew, locust, caterpillar; if their enemy besiege them in the land of their gates; whatever plague, whatever sickness there be:

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

If they have sinned against thee, (for there is no man that sinneth not,) and thou be angry with them, and give them up to the enemy, and they have carried them away captives unto the enemy's land, far or near;

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