The match saw Mesut Ozil reach 50 Premier League assists in his 141st game, surpassing Eric Cantona as the quickest to reach that landmark, with the Frenchman doing it in 143 appearances.
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.
After league defeats by Tottenham, Manchester City and Brighton, the win over Watford came to ease the pressure on under-fire coach Wenger.
Arsene Wenger has admitted that the apathy of Arsenal fans is an ongoing concern, and has vowed to win back the trust of the club's support.
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Pierre-Emerick Aubameyang doubled the lead just short of the hour mark, running onto a pass from former Borussia Dortmund teammate Henrikh Mkhitaryan and rounding the goalkeeper to slot the ball home.
Arsenal, who had lost eight of their previous 14 matches in all competitions, remain in sixth place in the standings. But I wanted absolutely to win this game and it was hard, but overall, it gets us a little bit out of that negative spiral that we were in.
"But the most important thing is when the team wins". "But overall the spirit and desire was good". But we dealt well with the set-pieces.
Petr Cech (Arsenal): It's been a tough time for the keeper, who was forced to accept some responsibility after a bad result last weekend against Brighton.
It was also his first spot-kick save in England's top flight since February 2011.
Granit Xhaka: Has been better with his positioning in recent games, and he managed to make a crucial header during a crunch defensive situation in the second-half. In the first half, the game gave us the opportunity to be direct, fast and score goals, more than we did.