Arsenal have a mountain to climb if they are to progress to the quarterfinals of the UEFA Champions League after suffering a 5-1 defeat to Bayern Munich at the Allianz Arena on Wednesday night.<br /><br />The Bundesliga champions took the lead in the 11th minute through <span class=\"notranslate\">Arjen Robben, who was allowed space and time to shoot with his dangerous left foot.<br /><br />Against the run of play, </span><span class=\"hidden-xxs\" data-type=\"full\">Alexis</span> Sanchez picked up a loose ball and equalized for the Gunners after his penalty kick had been saved by <span class=\"hidden-xxs\">Manuel</span> Neuer just after the half-hour mark.<br /><br />The visitors were a goal behind again in the 53rd minute when <span class=\"hidden-xxs\" data-type=\"full\">Robert</span> Lewandowski scored with a header, before Thiago Alcantara increased the lead three minutes later after finding himself in a 1 on 1 situation with the goalkeeper.<br /><br />Arsenal were further opened up in the 63rd minute, with Thiago netting his second of the night and substitute Mueller completed the scoring with two minutes remaining.<br /><br />Nigeria international Alex Iwobi was substituted in the 66th minute, while Bayern number 27 David Alaba impressed in a full shift.<br /><br />Ifeanyi Emmanuel <br /><br />Photo Credit : arsenal.com <br />