Arsene Wenger shockingly announced on Friday that he will be leaving the club after a historic 22 years at the helm and one would expect that would serve as a reason for Arsenal to turn on their style against West Ham United. But that was not the case.The first-half saw Arsenal failing to play with the tempo that have been characteristic of them and failing to create many openings. West Ham's defence looked solid and the visitors perhaps got the better chances.Their situation got worse in the 45th minute as Elneny had to be stretchered off after he suffered a serious looking ankle injury. Neither team was able to work the net and they went into the half-time team talk goalless.Arsenal started the second half with a point to prove and Nacho Monreal opened the scoring as he brilliantly volleyed Xhaka's corner into the back of the net in the 51st minute.But in the 64th minute, Marko Arnautovic levelled things up as he was found by Manuel Lanzini inside the box and the Austrian brilliantly struck it into the far corner.Arsenal upped the tempo in a bid to win the match and their efforts paid off in the 82nd minute as Ramsey's attempted cross evaded everyone and went into the back of the net.The result was put to bed three minutes later by Lacazette whose finished expertly after some good team play from Arsenal. He bagged another four minutes later after some tidy work on the flank by Ramsey as he found the Frenchman inside the box who shot past Joe Hart.A morale boosting victory for Arsenal as they prepare to face Atletico Madrid in the semi-finals of the Europa League.As usual, Twitter came up with it's own views:TWITTER REACTIONS:Goals first:Monreal volleys Arsenal in front from Xhaka's corner kick. 1-0 pic.twitter.com/G4gKU2ObWB— Terje (@TerjeGIFs) April 22, 2018Arnautovic Goal vs @Arsenal #ARSWHU #GunnersForLife pic.twitter.com/3BY9XEzYTf— FutBolComps (@Playm10kerHD) April 22, 2018Ramsey's cross escapes everyone in the box and finds the back of the net. 2-1 Arsenal pic.twitter.com/LoNEl0hi4d— Terje (@TerjeGIFs) April 22, 2018Laca with another goal 😎⚽️ pic.twitter.com/ONtk5wgys0— The Daily Lacazette 🎺 (@Daily_Lacazette) April 22, 2018Alexandre Lacazette, Arsenal’s top goal scorer with his 15th goal of the season! pic.twitter.com/xXD2iU0P9D— ArsenalGIF (@ArsenalGIF) April 22, 2018Their first half performance did not go down well:Arsenal players said they would give everything in these final games and it looks like normal service. Maybe we've been wrong all this time and they were really trying after all 😂— Daily Cannon (@DailyCannon) April 22, 2018Sell koscielny and release Mustafi because this is absolutely disgusting. They can't even preform for their manager whose leaving after 22 years in charge. Absolutely disgusting— Anonymous Gööner (@Anonymous1076) April 22, 2018You people that think Arsenal players will win Europa for Wenger to finish on a high are in for the shock of your lives.These boys are not serious.Next coach will bin a lot of them.— The Boy. (@Amaechi__) April 22, 2018Such casual defending from arsenal so far, very disappointing so far, terrible decision making in the final third. WE CAN DO THIS, CMON ARSENAL— Sanchit Jaikumar (@ksjdasavage) April 22, 2018Come on Arsenal! pic.twitter.com/PqyP2cFc0K— Arsenal MIA Podcast (@305Cast) April 22, 2018#Arsenal fans are an embarrassment. The Emirates should be bouncing right now. So much for appreciating everything #Wenger has done for the club. #EPL #ArsWhu #WestHam— Soccer Amz (@Soccer_Amz) April 22, 2018Arsenal players playing like they want Wenger gone today— Ola (@olaolumalomo) April 22, 2018An arsenal fan looking at iwobi pic.twitter.com/phPUHR2uWW— ison (@isonafc) April 22, 2018Iwobi finally makes a telling contribution to the Arsenal cause by leaving the field— Paddy Corkscrew (@rabal) April 22, 2018Wenger is leaving and the players give THAT 45 mins. Just goes to show, blame is as much them as it is wenger. Spoilt Premadonnas. Anti-climax or what!!! #Arsenal #WengerOut #Wenger #ARSWHU #football— Marios Christodoulou (@MarioChristo85) April 22, 2018Me watching arsenal.No winning mentality#ARSWHU pic.twitter.com/wPLwvOOamj— Chizalam◢◤ (@emuchayJr) April 22, 2018They were praised later:Volley of dreams from Monreal! 👏🏻That’s his sixth of the season from the full back. 😱Arsenal 1-0 West Ham. pic.twitter.com/wIcootiCgO— MobileBet (@MobileBetUK) April 22, 2018Auba moves central, Ramsey and Lacazette both score. Mister Wenger's done it again.— Lewis (@LGAmbrose) April 22, 2018The team is something different after that opening goal. THIS IS ARSENAL!— Captain Qwark (@rohaannair) April 22, 2018Ooohhhhh Arsenal pic.twitter.com/xc0rL3KGsh— Hussain MD (@WhoSSayin_) April 22, 20186 goals in 6 games since Lacazette returned from injury.— Osman (@OsmanZtheGooner) April 22, 2018Lacazette more goals than Morata. pic.twitter.com/rvb8KRfWYs— MobileBet (@MobileBetUK) April 22, 2018Amazing how all the laca haters have lost their voice! #Lacazette #AFCvWHU #Arsenal— Simon Smith (@NorthBanker80) April 22, 2018Stats to take away:Nacho Monreal has now scored as many league goals this season than in his entire first-team career before.⚽️⚽️⚽️⚽️⚽️ in 306 league games before.⚽️⚽️⚽️⚽️⚽️ in 26 league games this season. pic.twitter.com/TsLp5dKI0s— Squawka Football (@Squawka) April 22, 2018Arsenal 1-1 West HamMarko Arnautovic scores his tenth Premier League goal of the season and becomes the first West Ham player to reach double figures in the competition since Diafra Sakho (2014/15).Follow the action live -- https://t.co/Vqf0LRBgQq #ARSWHU pic.twitter.com/F6hmVQNmxm— WhoScored.com (@WhoScored) April 22, 2018Alexandre Lacazette has scored 6 goals in his last 6 @Arsenal apps at Emirates Stadium #Arsenal pic.twitter.com/787HVtqCYr— Sky Sports Statto (@SkySportsStatto) April 22, 2018.