Andy Monkhouse scored a goal in each half as Brentford were beaten by Hartlepool United.
The Bees slipped behind towards the end of an even first half and then conceded a second on the break.
Gary Liddle added a third inside the final ten minutes to seal the win.
The home side grew in confidence as the match wore on and were worthy winners by the end.
The Bees could have been ahead inside a minute when Gary Alexander met a Myles Weston cross but his powerful header was well saved by Scott Flinders.
The first quarter of the match was fairly even, Brentford probably had more of the ball but Hartlepool had the attempts on goal.
Monkhouse had a shot blocked by Kevin O'Connor before he forced Richard Lee into a low save.
Leon McSweeney wasn't far away with a long range volley and another effort was deflected into the arms of Lee.
Robbie Neilson headed a Saunders free kick wide at the far post and Myles Weston had a shot blocked after he picked up an Alexander lay-off.
The game was still pretty even as half time approached but the home side edged ahead late in the first period.
Brentford failed to clear as Hartlepool streamed forward after a corner was cleared, Monkhouse got a shot off that Lee saved but couldn't hold but the goalkeeper recovered well to save again from Antony Sweeney.
But Monkhouse was lurking and his shot cannoned off the crossbar and, according to assistant referee Dave McCallum, over the line.
Lee saved well from Sweeney as Brentford failed to clear a corner and McSweeney headed wide as Hartlepool attempted to seal the game before the break but The Bees ended the half strongly.
Saunders had a shot deflected wide and from the resulting corner Weston lifted an effort narrowly over.
The Brentford winger shot over at the near post from an Alexander pass but The Bees went to the break behind.
They had opportunities to level soon after the re-start - Sweeney headed narrowly past his own post from a Saunders free kick and Peter Hartley made an important tackle to deny Robbie Simpson after a fine turn.
Flinders saved a Saunders header and from his clearance Hartlepool scored their second.
Mr McCallum left his flag down as Sweeney got in behind, he cut it back to Monkhouse and the striker finished with ease.
The home side were now buoyant, and had chances to seal the game.
Hartley headed wide at the far post and McSweeney saw a free kick deflected over before Lee saved superbly from Ryan Donaldson.
Alexander had a chance to pull one back when Weston nodded down a Saunders cross but he couldn't make a firm connection and Flinders saved.
At the other end Lee was in action again to save well from Sweeney and then Monkhouse.
Brentford manager Nicky Forster rung the changes in an attempt to pull his side back in to the game - introducing Adam Reed, Leon Legge and Lewis Grabban - but Hartlepool were still on top.
Monkhouse shot over as he attempted to complete his hat trick and Liddle added a third with six minutes remaining when he smashed in from ten yards from a Colin Larkin nod down.
Brentford had chances to score - Legge looped a header narrowly over and Reed and Grabban had shots blocked - but Hartlepool were determined to keep a clean sheet.
Saunders had a weak shot saved in stoppage time and that meant The Bees had nothing to show from their long trip.
Hartlepool United: Flinders; Haslam, Hartley, Collins, Horwood; Sweeney, Murray (sub Humphreys 75 mins), Liddle, McSweeney (sub Brown 86 mins); Donaldson (sub Larkin 70 mins), Monkhouse
Subs (not used): Rafferty, Gamble, Boyd, Bjornsson
Bookings: Murray (52 mins), Brown (90 mins)
Brentford: Lee; O'Connor, Neilson, Osborne, Woodman; Saunders, Bean (sub Legge 58 mins), Diagouraga, Weston (sub Grabban 74 mins); Alexander, Simpson (sub Reed 58 mins)
Subs (not used): Moore, Balkestein, Byrne, Bignall
Bookings: Reed (61 mins), Legge (78 mins) (fifth of season)
Attendance: 2,936 (139 Bees fans)
By Chris Wickham