That Sweet EnemyBy: Isabelle Tombs, Robert Tombs From Blenheim and Waterloo to 'Up Yours, Delors' and 'Hop Off You Frogs', the cross Channel relationship has been one of rivalry, misapprehension and suspicion. But it has also been a relationship of envy, admiration and affection. In the nearly two centuries since the final defeat of Napoleon, France and Britain have spent much of that time as allies an alliance that has been almost as uneasy, as competitive and as