They were two nil up through Aaron Brown and Dev player Oneal Garnes before Marlow hit back with two goals and also missed two pens.
A late leveller from Oneal Garnes to make it 3-3 looked to have secured a point for United but Marlow showed why they won the league with a never say die attitude and continued to chase the 3 points and their superior fitness told in the end with 3 goals in the last ten minutes,