'Enemy' in the Bible

"When you wage war in your land against an enemy who is hostile to you, you are to sound an alarm with the trumpets. Then you will be remembered before the face of the LORD your God and you will be delivered from your enemies.

God is bringing them out of Egypt with the strength of an ox. He'll devour enemy nations, break their bones, and impale them with arrows.

or if he hit him with a stone carelessly so that he was fatally injured, though he isn't his enemy and he wasn't seeking to commit evil against him,