Contravallation :: Contravallation (n.) A trench guarded with a parapet, constructed by besiegers, to secure themselves and check sallies of the besieged..
Contravene :: Contravene (v. t.) To meet in the way of opposition; to come into conflict with; to oppose; to contradict; to obstruct the operation of; to defeat.
Contravene :: Contravene (v. t.) To violate; to nullify; to be inconsistent with; as, to contravene a law..