Why, then, would they seek to expand their borders into a region of space that is flanked by two potentially fierce enemies?

I didn't know Maxwell had made such fierce enemies already.

When her crew boarded the Enterprise they would be a fierce enemy, with no avenue of retreat.

But that is no reason to surrender the field of debate to our fiercest enemies.

Tlaxcala was an autonomous state, and a fierce enemy of the Aztecs.

There he proved himself to be a fierce enemy of slavery.

Kahless wanted to make him suffer more, but time was his fiercest enemy at the moment.

It was against old beliefs, but our people feared hunger and the fierce enemies coming down from the North, so some went back.

They are fierce enemies in battle and their charges are deeply feared.

Ibrahim and Constantine fell in the hands of the fierce enemy.