SIX years ago Benfica came to Glasgow on Champions League duty .
SIX years ago Benfica were battered 3 - 0 by Gordon Strachan 's rampant Celtic side in front of 60,000 fans .
SIX years ago Benfica came to Glasgow on Champions League duty and were battered 3 - 0 by Gordon Strachan 's rampant Celtic side in front of 60,000 fans .