The French will have been hit by an unseen enemy.

The dog was warning the unseen enemy to stay back.

At the ball, he is attacked again by an unseen enemy.

One quick response was a call for revenge against an unseen enemy.

Can a country be engaged in an invisible war against an unseen enemy?

They had not been drilled to fight an unseen enemy.

I don't want some unseen enemy crawling up my tail.

Any sudden motion could draw attention from an unseen enemy.

Surely the unseen enemies had their own plans of succession.

Turning his back to the unseen and uncounted enemy was difficult.