Things looked bleak early on when a slip from Michael Murphy allowed Leon Yarnie to turn and shoot at the near post forcing Barnard into an early save.
This seemed to spark Slough into action and minutes later Wharton and Canavan had a coming together which nearly presented Slough with a clear opportunity. That opportunity was created seconds later when a neat through ball from Metcalfe played in Salaka whose shot was blocked on the edge of the area by the advancing Beames. The ball fell to Nsubuga whose shot was tipped wide. From the resulting corner Slough nearly claimed the lead when two efforts from Dean Harper were cleared from the line.
On thirteen minutes an error from Metcalfe presented Yarnie an opportunity but he fired straight at Barnard who claimed the ball easily.
Nick Roddis had the next chance for Slough after a great run from inside his own half however the final shot was weak and Beames claimed easily.
Just short of the half hour a through ball played Durrant in behind the defence and as Barnard advanced the two players collided but not before the ball was squared to O’Brien who headed home, on debut, unchallenged.
The remainder of the half was a scrappy affair and as Alison Chapman blew the half time whistle the Rebels would have felt unfortunate go in behind.
Slough would have been looking to put an end to their habit of starting the second half badly but once again fell short and started poorly a flicked header was misjudged by Harper who allowed O’Brien to nip and score his and Burnham’s second.
It is tempting to say Slough let their heads drop as the next fifteen minutes saw them largely clinging on creating only half chances themselves and relying on two more fine saves from Barnard to keep the score down.
However, it was an injury to the impressive Landy Salaka which changed Slough’s fortunes. He was replaced by Stanley Mugisha and fifteen minutes later the 17-year-old followed up an Attrell shot to fire past Beames for his first Slough Town goal.
Slough began to press for what may have been a deserved equaliser but were caught by the ultimate sucker punch as former Rebel Byron Bubb fired home from the edge of the area as the game entered stoppage time.
The drama was not over - in the dying seconds Owens picked up a second booking for handball and was shown the red card. No sooner was the free kick taken than the final whistle was blown.
Burnham Line up
J Beames, A Durrant, C Owens, R Wharton, L Canavan, S Goodhram, J Brown, D Willment, L Yarnie (B Bubb), B O’Brien (J Dowdican), M Norman (T Gibbs). Subs not used: J Tallentire, P Howard.