JOIN USThe result in east London left Orient fans celebrating as if they had won the game and dreaming of finishing the job in the replay at Arsenal's Emirates Stadium to earn a quarterfinal meeting with Manchester United at Old Trafford.
Tehoue, a pacy but erratic 26-year-old French striker who is often used as a late substitute, squeezed past defenders Kieran Gibbs and teenage debutant Ignasi Miguel on the edge of the penalty area and smashed the ball through the legs of Arsenal goalkeeper Manuel Almunia.
Until then Arsenal, who made 10 changes from the side that beat Barcelona in the Champions League on Wednesday, looked comfortable after taking the lead through a 53rd-minute Tomas Rosicky header.
Orient had been largely outplayed and outpassed as Arsenal appeared to be coasting to victory and a clash with United in the last eight.
But Tehoue's goal means they will replay at the Emirates in London on March 2 with the money raised set to provide a financial lifeline for the League One (third tier) club, 53 places below Arsenal in the ladder.
Orient chairman Barry Hearn promised his squad a trip to Las Vegas if they avoided defeat and laughed afterwards that his manager Russell Slade had out-thought Arsenal's astute boss Arsene Wenger by leaving it late to bring on Tehoue.
Wenger told ESPN that Tehoue had made a difference. "He scored a great goal but we had the right attitude, we were focused and they took advantage of one of our few mistakes," Wenger said.
"It was difficult for us to create more chances and a lot of credit to them for they defended well."