City returned from Chorley with a point after pulling back a 2-1 half time deficit to go into a 2-3 lead before conceding from a 77th minute corner.
Chris Doyle put The Magpies into a 13th minute lead before Dunkley equalised in the 20th minute. James Dean put Chorley ahead again in the 30th minute to give a 2-1 half time lead.
Two goals in less than a minute from Tristan Dunkley and Mike Symons gave City a 2-3 lead before Doyle added a third for Chorley with a powerful header.
Match Report and Highlights will follow