arsene wenger was delighted as danny welbeck struck a second half winner to put arsenal in the semi finals of the fa cup with a 2 1 victory over his former club manchester united, who were reduced to 10 men at old trafford the gunners took the lead midway through the first half as alex oxlade chamberlain weaved his way through the united defence before teeing up nacho monreal to coolly slot his close range shot past a diving david de gea and into the bottom corner it did not take long for the hosts to level matters and wayne rooney did the damage as he directed angel di maria's beautiful cross into the back of the net via a well timed header mesut ozil poses for a picture in the away dressing room at old trafford after arsenal's fa cup win  alexis sanchez posted this picture on instagram from inside the arsenal dressing room after the match  calum chambers put this photograph on instagram as arsenal enjoyed the ride home from old trafford  arsenal duo santi cazorla (left) and laurent koscielny celebrate after the final whistle  but welbeck handed arsenal the lead for the second time as he beat de gea to the ball just outside the 18 yard box and tapped into an empty net just after the hour mark wenger admitted he was proud of how his side executed their game plan, and told bbc 1: '(we wanted) to start without apprehension but we were caught a few times here '(we tried) to be on the front foot from the start and close them down, play with a high pace and i felt that we did that well' di maria received two bookings in quick succession as he was first shown a yellow card for diving and then was sent off after grabbing at referee michael oliver's shoulder in protest with just under 15 minutes left arsenal were drawn against bradford or reading in the last four and wenger added: 'last year we played a tricky game at wembley in the semi final and you expect that again per mertesacker (centre) and aaron ramsey jump for joy after reaching the fa cup semi finals  goalkeeper wojciech szczesny applauds arsenal's 9,000 travelling supporters at old trafford  'we have played bradford before, we know about that but let's enjoy tonight 'i feel we played a good game tonight from the start and we deserved to win the game' wenger was full of praise for welbeck, who left his boyhood club for north london last summer, and provided the killer touch tonight after a blunder from antonio valencia the manager said: 'i believe he is just happy to score he worked very hard today and he was rewarded by a good goal' the gunners went to old trafford on the back of a fine run in the barclays premier league, with seven wins in the last eight games putting them third, now a point ahead of united and only four behind manchester city danny welbeck slots home the winning goal after rounding his former team mate david de gea  welbeck didn't hold back in his celebrations after scoring against his old club for the first time  but they are battling to stay in the champions league after a 3 1 first leg loss at home to monaco two weeks ago which they need to turn around a week on tuesday wenger continued: 'we live in the real world and we play game by game, we want to compete in every competition and i believe the result today can give us some good morale' welbeck appealed for a penalty as he went to ground after a touch from marcos rojo just inside the 18 yard box during the first half, but oliver waved play on wenger said he thought it was a spot kick, but admitted he was pleased with his side's performance despite not winning that appeal the frenchman added: 'we had (a shout for a penalty) i think what is the most important when you're a manager is that the team performs at a good level   and that's what we did'
arsene wenger the fa cup quarter finals danny welbeck manchester martin samuel's mesut ozil old trafford arsenal
arsenal beat manchester united 2 1 in the fa cup quarter finals  arsene wenger was pleased with his side's approach at old trafford  mesut ozil posed for a picture in the away dressing room after the game  danny welbeck netted the winning goal against his former club  click here to read how all the action unfolded  manchester united 2 1 arsenal: martin samuel's match report 