United picked up an important three points with their 2-1 victory at Arsenal on Sunday.
Ferguson told Sky Sports: “We created an amazing amount of chances and to only score two is a bit disappointing.
“We should have rammed home our advantage in the first half, and in the first 15 minutes of the second half they had three great chances and missed them all, so we rode our luck.
“When they put (Per) Mertesacker up and kept tossing the ball into the box, you never know what’s going to happen but we coped well with that, (Chris) Smalling was fantastic in that period and we managed to see it out.”
Ferguson added: “Winning after City had won was the important thing but we’ve done it in the right way.
“We were really adventurous, positive and had a great belief in ourselves.”
