Just before half time centre half Ryan Strachan missed a chance to level and that proved to be crucial as a minute after the restart Falkirk went two up with Mitchell scoring with a header from a corner.
Brian Neill, who has been in fine form on late, then had a chance to grab a goal back but it was not to be. Robertson made it 3-0 with a good strike on 62 minutes to give Falkirk a slightly flattering score line.