'Enemy' in the Bible

When thy people Israel be smitten down 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 in the land famine, if there be pestilence, blasting, mildew, locust, or if there be caterpiller; 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, whithersoever thou shalt send them, and shall pray unto the LORD toward the city which thou hast chosen, and toward the house that 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 captives unto the land of the enemy, far 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 work evil in the sight of the LORD.