1.   In a telling example, when Burr was accused of fraud in the European land deal, he quickly challenged his accuser to a duel.

2.   Then, to the astonishment of the audience of blue-uniformed officers, Gallardo was allowed to challenge his accuser on the witness stand, face to face.

3.   Cordoba, who spent more than five years as an adviser to Salinas, at the time challenged his accusers to prove he was involved in the death.

4.   Former mayor challenges accuser.