Mangotsfield had the conditions in their favour during the first half playing down the slope and with a keen wind at their backs.
With five minutes played Mangotsfield were awarded a spot kick after a hand ball in the area, Neil Arndale
converting his third penalty of pre-season.
As the Field continued to press a Charlie Rich
corner was headed off the line and a flicked header from Marcus Duharty
went inches wide.
Liam Douglas went close on thirty minutes rising above the Galmpton defence only to head just over the crossbar.
With half time approaching Marcus Duharty
worked the ball to Todd Winter
whose first time cross from wide on the left found the advancing Kyle Thomas
who headed home from six yards to send Mangotsfield in two up.
Despite playing into the wind and against the slope Mangotsfield started the second half well with Marcus Duharty
On fifty one minutes Duharty turned provider after collecting the ball in midfield and finding Kyle Thomas
who finished well from an acute angle guiding the ball across goal into the bottom corner.
The hosts side began their fight back on fifty five minutes reducing the arrears after a cross from the right was drilled home. Two minutes later another cross from the right was headed home.
Galmpton were level with twenty minutes remaining scoring from the penaly spot after Sam Teale
was harshly adjudged to have committed a foul inside the area.
In the eightieth minute the comeback was complete, the home side scoring the decisive fourth goal after a shot from a corner played short went through a crowded penalty area to nestle in the bottom right hand corner of the net.
Mangotsfield pressed for an equaliser, the best chance coming in the final two minutes when a free kick from Charlie Rich
bobbled in the box and was stabbed home in the ensuing melee only for the referee to disallow the goal after spotting a foul on the goalkeeper.
Line up : 1. Dale Peckham, 2. Neil Arndale
, 3. Tom Parrinello
, 4. Liam Douglas, 5. Sam Teale
, 6. Matt Thorne
(20', Joe Turley
), 7. Kyle Thomas
, 8. Nick Dunn
, 9. Marcus Duharty
(60', Mike Whittington
), 10. Todd Winter
(46', Josh Klein Davies
), 11. Charlie Rich