Pierre-Emerick Aubameyang rolled home a nerveless second-half penalty as Arsenal struck a huge blow in the race for the top four.
Granit Xhaka had put us ahead with a long-range goal in the opening half, but after a dangerous United side repeatedly threatened to draw level, Aubameyang exorcised the demons of his penalty miss last weekend to seal a huge three points.
It was just reward for a hard-working, battling performance.
We started like a side determined to put Thursday's poor result behind us, and soon started to rack up the shot count in the opening half.