'Enemy' in the Bible

And if ye go to war in your land against the enemy that oppresseth you, then ye shall blow an alarm with the trumpets; and ye shall be remembered before Jehovah your God, and ye shall be saved from your enemies.

or have smitten him with any stone wherewith one may die, without seeing him, and have cast it upon him so that he die, and he was not his enemy, neither sought his harm: