A superb performance on what looked like it a difficult night for Garstang gave them three points.
With four players already unavailable due because of work, things got worse when skipper Gaz Fawcett broke down on the motorway, Chris Byrne was stuck in traffic and Dan Birch arrived five minutes before kick off.
As a result, Garstang shuffled their remaining players but the first half-hour saw no real chances.
Garstang’s back four restricted Burscough to one long range shot which Tom Swallow smothered comfortably.
The visitors’ best attempt came after good build up play and saw Matt Poole shoot just wide as the first half finished goalless.
Garstang came out of the blocks very positively in the second half as Alan Coar charged down an attempted clearance and only desperate defending stopped him from scoring.
Tom Entwisle shot wide and Jonny Hothersall saw an attempt cleared at the back post before they broke the deadlock.
They won a corner which saw Entwisle’s cross headed in by Kieran O’Connor to give the Riversiders a 53rd minute lead.
Burscough tried to respond but the best they could offer was a shot from the edge of the box which Swallow dealt with at the second attempt.
It was 2-0 on 63 minutes when Alan Coar controlled a cross before smashing an unstoppable shot into the net from 10 yards.
By now the home players were chasing shadows as The Riversiders knocked the ball about with confidence, and on the odd occasion they lost possession, it was won back straight away.
The icing on the cake came 13 minutes from time when another Entwisle corner was nodded in by O’Connor for his second and Garstang’s third.