More recently it has put in place a second, and more subtle, line of defence.
The transformation of a losing into a winning position, the interplay of attack and defence, are subtler than in other sports, with more scope for ups and downs and changing tempos.
The third defence is more subtle: these churches are much less Disneyfied than they appear.
One of the players of the season, he mixes subtle attacking skills with ferocious defence, and his exclusion from this week's Super League Dream Team robbed that hypothetical selection of much credibility.
The sight of Barkley running at Villa's defence and providing subtle touches in and around the area lifted the spirits of Everton fans who have witnessed Martinez's side make an undistinguished start after last season's top-five finish.
Thus, small differences in the largely conserved binding pockets probably dictate the subtle binding preferences of these defence lectins.
And Justice Kennedy, in particular, appeared to have absorbed the subtler dimensions of the government's defence of the law.
Soon afterwards a subtle pass from Charlton bewildered the German defence but Peters could not suite reach the ball for the shot.
Although they could avoid being sued for breach of confidence thanks to a public interest defence, this did not prevent subtle or open victimisation in the workplace, including disciplinary action, dismissal, failure to gain promotion or a pay rise.
The overall picture emerging from these results point to a significant, albeit phenotypically subtle, perturbation of function in relation to microbial defence, viral immuno-surveillance and cell growth amongst patients with post-infectious chronic fatigue.
