A first half goal on 41 minutes by Fraser was cancelled out in the second half by a Cambridge equaliser after some poor marking by Charlton, although Woolacott made a good save to keep out the initial header. This gave Cambridge confidence and momentum, although Charlton applied pressure in the six minutes added on.
Former Charlton keeper Dimitar Mitov denied his old club when he turned an Albie Morgan free-kick around a post in the eighth minute, while Jayden Stockley dragged a good chance across the face of goal.
The Addicks went ahead in the 41st minute, Scott Fraser on hand to head in from a few yards out after Mitov had initially kept out Jayden Stockley's close-range effort.
Cambridge levelled on the hour mark, reward for an improved attacking display after the restart. Joe Wollacott superbly kept out Sam Smith's header but Shilow Tracey's follow-up shot was helped over the goal line by Knibbs.
Stockley had the chance to restore the lead but volleyed wide from substitute Corey Blackett-Taylor's left-wing cross.
Blackett-Taylor came on as a substitute but had to be withdrawn injured. Aaron Henry replaced him for his league debt and impressed, but Dunk blocked his goalbound strike. Ben Garner was booked for complaining about the Blackett-Taylor incident. Ben Garner has apologised for his conduct but thinks that the Cambridge player should have been sent off: https://londonnewsonline.co.uk/charlton-boss-felt-cambridge-player-should-have-been-sent-off-but-apologises-for-his-own-touchline-reaction/
Steve Brown said that Cambridge pressurised enough in the second half for an equaliser. Garner would be frustrated that they had not won. We had been forced into wide areas and has to put crosses into the box.
Ben Garner said it was a frustrating afternoon. We gave Cambridge momentum in the second half with some of our decision-making. The last ten minutes we were much, much better. We could have moved the ball a bit quicker, in the second half we were a little bit slow, a little bit sluggish. The officiating didn't help in the second half. There was a spell of fifteen to twenty minutes when we didn't get a decision at all. Blackett-Taylor was being assessed, it was a heavy whack.
He says that the team are learning from every game: https://londonnewsonline.co.uk/below-par-decision-making-helped-cambridge-get-more-of-a-foothold-at-charlton-athletic/
Charlton had 66 per cent of the possession, but shots on target were just five to four. Corners were eight to four.
Charlton remain 6th in the table. Reported attendance 12,644, 792 away fans.