A derby victory over Manchester City at Wembley helped Erik ten Hag’s team gain some self-respect after recent domination by their closest rivalsSign up to Jonathan’s weekly newsletter hereSome days, you wonder just why the FA Cup seems so embattled. Perhaps it wasn’t quite Sunderland beating Leeds in 1973 or Southampton beating Manchester United in 1976 (or even Wigan beating Manchester City in 2013). The status and histories of the clubs shouldn’t disguise what a shock United’s victory over City was.For United, it was a great occasion. For them a first FA Cup in eight years and just their second trophy in seven, a step-up on the League Cup they won under Erik ten Hag last season. But more than that, they stopped City becoming the first club to win the Double in successive seasons.