Pierre-Emerick Aubameyang doubled the Gunners' advantage in the second half, before Henrikh Mkhitaryan fired in a third in the 77th minute from the edge of the box for his first Premier League goal for the Gunners.
It was a moment of sweet vindication for the hosts after the Watford captain questioned the courage of the Gunners last October following the Hornets' win over them at Vicarage Road.
"We're always playing for those who come and support us, who are really supporting us, they are real fans who are not just coming to the stadium when we are winning, we have nothing to say".
And on his 141st appearance for Arsenal, Ozil, who is well-known for his creative abilities, subsequently became the fastest player in Premier League history to reach 50 assists.
"But the most important thing is when the team wins".
Although the attendance given was close to capacity there were thousands of empty seats
Granit Xhaka had a long-range shot stopped by Karnezis as Arsenal began the second half brightly, and moments later Cech was relieved as a Watford corner flew dangerously across his six-yard area with no visiting player able to get a touch.
Speaking specifically about Cech's clean sheet record, Wenger praised the 35-year-old for his ability to stay at the top over the course of his career.
"I want our fans to be behind the team and be happy. said the Frenchman", whose side are sixth, 12 points adrift of fourth-placed Liverpool despite building upon their Europa League win against AC Milan on Thursday. It is quite fortunate that it was against Deeney.
The Czech Republic and former Chelsea 'keeper also saved a penalty on his way to bringing up a 200th EPL clean sheet over the last 14 years. I didn't play a lot in January so it was hard to find the rhythm.
Four of Mustafi's five Premier League goals have been assisted by Mesut Ozil (two from corners, two from free-kicks) - all four of the Ozil-assisted goals have been at the Emirates.
"We need more games, we had a nightmare week, overall there is some work still to do". I can't play every three days. They all say no, but we know all - it's not true.
"We had a massive game in Milan and we managed to win there with a clean sheet".
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