Leinster trailed 20-16 as the game drifted to a close but then the visitors galvanised themselves for a final effort and their courage paid dividends when Hickie crossed for the all important try. O'Meara added the conversion to give them a little more breathing space and they clung on for a famous victory, a first for them on French soil against a side who had never been beaten in this competition at home.
It was a try from Gordon D'Arcy, after the home side had gone 17-9 ahead, that put Leinster back into the match and set them up for a marvellous finish.
Afterwards, a delighted coach Matt Williams paid tribute to his side. "It was just a wonderful performance from an exceptional bunch of guys who it is my privilege to coach."
There was further good news for Leinster when the result of the Swansea v Bristol match came in, Swansea causing a majoir upset by winning 26-19.