West Ham were held to a draw by Championship side Bristol City in the third round of the FA Cup on a frustrating day for David Moyes.
The Hammers looked on course for a comfortable afternoon when Jarrod Bowen fired them into an early lead.
It proved to be anything but, however, after a second-half equaliser from Tommy Conway secured a replay for the rocking Robins.
West Ham's squad would have been given a whole a week off had they won this third-round tie, but they will now be dragged back in on Friday as Moyes, who reached Wembley twice as a player with City, prepares for a return to Ashton Gate.
Almost 9,000 members of City's cider army - among an impressive 62,500 sell-out - made the trip to the capital, but the raucous bunch who filled the Sir Trevor Brooking stand were silenced after just four minutes.
Lucas Paqueta dropped deep to collect the ball and lifted a delicious pass over the top to Bowen.
The England hopeful still had work to do, controlling the ball before knocking it past the dive of City keeper Max O'Leary and beating covering defender Cameron Pring on the goal-line.
Sadly for West Ham it was Paqueta's last involvement in the match. The Brazilian playmaker was only just back from a knee injury and seemed to suffer a recurrence.
Teenage striker Divin Mubama was sent on as a replacement for a rare chance to impress.
West Ham almost doubled their lead when Bowen got round the back of the City defence and pulled the ball back, but O'Leary made a superb reaction save to claw out Pablo Fornals' shot.
O'Leary made another fine stop to prevent an own-goal from Pring, who inadvertently turned Bowen's cross-shot towards his own net, and then tipped a James Ward-Prowse volley wide.
Moyes was forced into a second substitution after just 38 minutes when Konstantinos Mavropanos was hurt after an aerial challenge with Conway, with veteran defender Angelo Ogbonna sent on.
City, 11th in the Championship and on a run of one defeat in five matches under former Hammers Under-23 coach Liam Manning, threatened sporadically in the first half.
But Sam Bell shot straight at Lukasz Fabianski and Rob Dickie's header was also too close to the Polish keeper.
City should have drawn level early in the second half when a low cross from captain Jason Knight eluded everyone in the box and fell to Pring, who lashed his shot wide at the far post.
But on the hour mark the away fans behind the goal were delirious when Joe Williams pinged the ball forward.
Ogbonna missed it and Conway raced forward before burying his shot across Fabianski and into the net.
West Ham poured forward in a bid to avoid a replay - and preserve their week off - but Tomas Soucek headed over and substitute Danny Ings hit the sidenetting.
