claim: DodgeBall: A True Underdog Story has Vince Vaughn and Ben Stiller in starring roles.
evidence: A rearguard is that part of a military force that protects it from attack from the rear , either during an advance or withdrawal .. The term can also be used to describe forces protecting lines , such as communication lines , behind an army .. Even more generally , a rearguard action may refer idiomatically to an attempt at preventing something though it is likely too late to be prevented ; this idiomatic meaning may apply in either a military or non-military context .. idiomatically. idiom