He was at war, facing an enemy force of unknown size.

We may very well have a hostile force of unknown size on our flank, and no forces on this side but us.

In the late 10th century, there were 30 such banda, of unknown size.

The Marines engaged a communist force of unknown size in heavy combat.

Daniel was genuinely glad to have observed a creature of previously unknown size.

She was on her own, not lost, but getting there, preparing for a face-off with a force of unknown size and capability.

The low hills, on the part closest to the road, were occupied by an outpost of unknown size and, they had heard, "some big mortars."

Havana also shelters other non-Cuban population of an unknown size.

The contingent of Chechen soldiers, while large, is of unknown size.

Q:View a square city at the south of unknown size.