Aaron Ramsey continued his fine scoring form, with Arsenal's second goal on 84 minutes - his 6th competitive goal this season, which set up Arsenal's record 10th successive away win.
Arsenal manager Arsene Wenger admitted, however, that he was surprised by the 23-year-old's goal exploits'
'Honestly, I didn't expect him to score so many', said Wenger.
Wenger told Sky Sports: 'He (Ramsey) was outstanding and his form is linked to confidence. For a while, he was getting into the box and not scoring, and now every time he is in a good position he scores. Goals can come in cycles; at the moment they are coming for him'.
Arsenal's so-called Champions League 'Group of Death' doesn't look so deadly now, with Arsenal currently in joint top slot with Napoli, who beat Borussia Dortmund 2-1 at home.
And several Arsenal stars hit Twitter to express their delight at what was a perfect start to their latest European campaign:
(The injured) Alex Ox-Chamberlain - 'Rambo is on fire right about now!! Another very good goal and performance from him!'
Aaron Ramsey - 'It's a happy coach journey home with
Mesut Ozil - 'three points - a perfect start in the CL'.
Jack Wilshere - 'Great start to the group! But must keep it going.
#Gooners that travelled were amazing'.
(The injured) Lukas Podolski - 'Well done guys !! Important start and 3 points'
image: © wonker