Sortie

[doktor]

A rebel force has entered a town in W. Virginia. If I enter the region will
the rebel force be trapped unless a relieving column enters the region?

Dave
San Diego, CA
Home of the World's Busiest Radar Approach Control

[Durk]

Yes.

And welcome to the forum!!

[ArmChairGeneral]

Yes, long as you bring a large enough force that the enemies inside the structure can't successfully chase you off by just attacking you. A cavalry brigade won't trap a division, but an equal or larger force almost certainly will.