I would imagine it would be a bunch of broken squads scattered in front of or in the VC area. Which, although can't do anything, does hinder all movement through them by the enemy. Thus causing the enemy to not be able to reach the VC area in time.
Ayup. It is often the case that a MF or two can spell victory or defeat. Deny those enemies a critical path with your silly brokies and you just may turn the tide!