Neither Sir Alex Ferguson or Arsene Wenger were involved in the fixture for the first time since 1986, but the former was in the stands for an encounter as entertaining as some of the memorable clashes during their Premier League duopoly.
Arsenal took the lead in the 26th minute when United goalkeeper David De Gea mishandled Shkodran Mustafi's header off Lucas Torreira's cross, which dropped behind De Gea and out of reach of Ander Herrera's attempt to clear.
Some of them had not played all season, Chris Smalling playing in very hard condition, but Arsenal were only unsafe when we lost the ball in bad areas. "We are going to wait for what the doctor tells us but it is maybe a big injury", Emery said.
Arsenal were trying to follow up their 4-2 win over Tottenham on Sunday by knocking off another rival.
United came into the match against Arsenal with no win in three Premier League matches, while their opponents were unbeaten in 19; and while Darmian said he and his teammates had targeted a win beforehand, they were ultimately satisfied with a draw, having twice come from behind.
"The character we showed after going behind, to come back in that fashion is what we expect from this team", said Milner. "It is not the best, but it is not the worst", he said.
At first glance, it seemed like it was Rojo who had the last touch; a couple of replays later, it did not. Everyone who loves football will see that this was a good match for us. "Gary Neville must be thinking now Manchester United has a right-back for 10 years, a very good right-back for 10 years".
When asked about the challenge of overhauling Manchester City at the top of the Premier League, Emery conceded: "It's very hard". Usually United create a lot of chances here, and I don't think we conceded a lot of chances. "For us, for our confidence, our level in the competition and our way, I think we can think very positively".