Benn and Watson squared off on 21 May 1989 at the Majestic Ballroom in north London .
Watson demonstrated courage , guile and an airtight defence on Benn 's way to knocking out Benn in the sixth round .
Benn and Watson squared off on 21 May 1989 at the Majestic Ballroom in north London and Watson demonstrated courage , guile and an airtight defence on his way to knocking out Benn in the sixth round .