Although Arsenal have a fairly miserable history against Manchester United at Old Trafford lately, winning a grand total of zero matches when travelling to meet the Red Devials since 2006. To be fair, their play at home hasn't been much better - you have to go a long, long way back before you find a game in which Arsenal haven't disappointed against Sir Alex Ferguson's side.
However, at SB Nation's Arsenal blog The Short Fuse, Ted Harwood is quite rightly pointing out that past records matter for not much at all:
That is all ancient history, now, though, of course. What matters now is that Arsenal pick themselves up from the events of midweek and put in a good showing up north. It's down to two competitions now, fixture congestion is clearing up some, and with a two week break looming on the horizon, there is perhaps a little room to really go for it this weekend.
If the Gunners have been saving up for a big performance against United, now's the time to give it. They've gone from quad-contenders to competing in two competitions inside the span of two weeks, and if they lose today that wait without a trophy will seem like even longer to the (admittedly spoiled) fans. The history of the tie doesn't matter at all - Arsenal need to go for broke at Old Trafford to get the win that will soothe the organisation's collective psyche.