Manchester United manager Sir Alex Ferguson knows he is in for his toughest title fight, possibly, of his career. Manchester City’s dream team may have slipped up, but they have the firepower to overcome any team. United know that after they suffered a 6-1 thrashing by city. That too, at Old Trafford. In fact it is the fall of Old Trafford as a fortress this season – both in terms of Europe and the Premier League – that has driven Sir Alex to call upon United’s ultimate weapon. It is the Manchester United supporters that will have a key role to play in the closing stages of the season, according to Sir Alex. In fact one noticeable fact has been a lack of vocal dominance this season from the Stretford End, helped in no small part by the lack of dominance on the field from the Red Devils. Writing in his exclusive column for ‘United Review’, Sir Alex said: \"It’s the right time to ignite the chemistry between the team and the supporters. “Our home record is not bad of course, but not as good as that of Manchester City, which is why today I\'m calling for a combined effort of players and supporters to get us to the line with winning form on our own ground. Our crowd can make a big difference.”