"The failure of such a project could only reinforce the mafia and encourage an underground army."

If the underground army is watching, they'll be likelier to follow me than you.

At its height, this underground army has as many as 100,000 people bearing arms.

It is the logic of an army: an underground army.

At those times underground army was scattered and divided into many small units, fighting on their own, without one strong aim.

He returned secretly to this country some time in 1955 and organized an underground army.

You say he had his own underground army?

I wonder if his underground army operated in the region?

What about the growing underground army of the predators?

As part of the underground army's training she acquired medical skills.