Terrains - Enemy Cards?

Is a terrain played by my opponent in battle considered to be an "enemy card?"

For instance, if I had an action that said "Battle: Destroy a target enemy card," could I use it to destroy a terrain my opponent had played at that battle?

In Response to this viewtopic.php?f=59&t=65299

I don't understand how a card controlled by an "enemy" is not an "enemy card"

The comprehensive rules state:

Code: Select all Enemy

In a battle or attack, if you are the Defender or a defending ally, "enemy" describes with a player who is the Attacker or an attacking ally, and units or armies on the attacking side; if you are the Attacker or an attacking ally, "enemy" describes a player who is the Defender or a defending ally, and units or armies on the defending side. See Sequence of Play, Attack Phase, Battles.

Therefore, if I am the attacker then an enemy card would be a card of the player who is the defender or a defending ally. Furthermore, if I am the defender, an enemy card would be a card of the player who is the attacker or an attacking ally.

Or more simply put, a card controlled by the defender or defending ally if I am attacking or a card controlled by the attacker or attacking ally if I am defending.

Finally since terrains are controlled by the player who played them and they must be played during battle, they must be controlled by a defender, defending ally, attacker, or attacking ally and would therefore be an enemy card to the opposite side.

If there is a flaw in my logic please explain it to me because I cannot understand how a card controlled by the "enemy" is not considered an "enemy card"