Brentford twice came from behind to win a point against their East London rivals at Griffin Park, and it was nineteen year old Charlie Ide who emerged the hero, scoring in the third minute of injury time to secure a valuable draw.
Bees manager Scott Fitzgerald made just one change from the side that lost at Bournemouth last weekend, John Mousinho returning from suspension to replace Thomas Pinault in central midfield.
Both sides started hesitantly, Shane Tudor should have done better when well placed on the edge of the box, but his touch let him down when trying to control Wayne Corden's cross. A minute later Corden drilled wide from a tight angle.
The Bees had their first chance of note in&nbsp;the ninth minute, referee Alan Wiley awarded a free-kick to Brentford around 25 yards from the Orient goal. Joe Keith curled the ball delightfully over the wall, only to see his effort bounce down off the crossbar, John Mousinho unable to keep his resulting header down, with the goal gaping.
Jo Kuffour had a chance to give Brentford the lead in the nineteenth minute, shooting wide from the edge of the box after good work from Charlie Ide.
The O's took the lead five minutes later, Jabo Ibehre controlling a long throw and turning Adam Griffiths to fire in a low shot which hit&nbsp;Nathan Abbey's foot to shoot into the roof of the net.
On thirty-five minutes Brentford came close to an equaliser when Charlie Ide's cross shot whistled across the goalmouth, Calum Willock stretching full length but not quite able to get on the end of it.
James Walker nearly doubled the lead for Orient on thirty-eight minutes, but Nathan Abbey was equal to his eighteen yard shot.
Willock then should have equalised just before the break, beating the offside track to face Orient keeper Glyn Garner one-on-one, but hitting his shot straight at him.
Brentford came out for the second half with more purpose and should have equalised just minutes&nbsp;after the&nbsp;kick-off, Andy Frampton drilling a shot across goal and Willock again just failing to get the crucial touch&nbsp;from&nbsp;all of three yards.
Garner was then forced into a low save to his&nbsp;right which he did well to hold, from Kevin O'Connor's drilled&nbsp;free-kick.
Fitzgerald made the first substitution of the game on fifty-seven minutes, Paul Brooker replacing Calum Willock, and moving onto the right side of midfield, with Charlie Ide partnering Jo Kuffour up front.
This move almost provided immediate dividends, as Ide fired home just a minute later, only to see his effort disallowed for offside.
At the other end, Shane Tudor tested Nathan Abbey with a fierce shot from the edge of the box, the Bees' custodian saving superbly to his left.
On sixty minutes Brooker fired in a cross from the right which Ide met with a superb diving header, met with an equally good save from Garner in the Orient goal.
From the resultant corner, the Bees were level. Joe Keith's corner was allowed to bounce in the Orient box, and Ide was quickest to react, bundling the ball home from six yards for his second&nbsp;professional career&nbsp;goal.
Brentford flooded forward looking for the winner, and&nbsp; loan signing David Partridge came within inches of getting on the end of another dangerous Keith corner.
However the Bees were dealt a real blow on eighty-four minutes when substitute Paul Connor found space in the box following a deflected free-kick, to curl a low shot past Abbey and into the bottom right-hand&nbsp;corner.
Brentford searched for the equaliser and came close in the last minute of the ninety, Partridge and Kuffour colliding when both trying to get on the end of a Brooker cross, and both unable to make proper contact with the ball.
As the fourth official held up an additional three minutes to play, Orient may well have felt that they had done enough, but Ide had other ideas, chasing down a long ball from Adam Griffiths to win a throw-in.
Kevin O'Connor saw his throw headed back to him, and as the ball bounced he bravely threw his head at it, powering the ball across the goal. Jo Kuffour got a flick on which may have been heading goalwards, but Ide and was taking no chances and slid in at the far post to secure a valuable point for The Bees.
Written by Matt Davis
Abbey; O'Connor, Griffiths, Partridge, Frampton; Ide, Leary, Mousinho, Keith (Peters 86); Kuffour, Willock (Brooker 58)
Subs (not used): Brown, Pinault, Charles
Booked: Leary (32), Ide (66)
Leyton Orient line-up:
Garner, Lockwood, Tudor (Demetriou 72), Easton, Miller, Ibehre, Saah, Corden (Barnard 90), Chambers, Thelwell, Walker (Connor 72)
Subs (not used): Morris, Palmer
Booked: Chambers (47)