Chris Eagles pounced on Gerhard Tremmel's mistake as Bolton came from behind to beat Swansea and book a place in the FA Cup fifth round.<br /><br />Eagles was the first to react after Tremmel failed to hold on to Martin Petrov's strike on 56 minutes.<br /><br />Luke Moore had put Swansea ahead against the run of play with a deft chip two minutes before half-time.<br /><br />Former Swan Darren Pratley equalised in first-half injury time, heading home Petrov's free-kick.<br /><br />The hosts, and Eagles in particular, made the brighter start, with the former Burnley man firing wide before seeing another shot blocked by Ashley Williams.<br /><br />David Ngog beat the Swansea offside trap but failed to beat goalkeeper Tremmel, and later failed to connect with a volley.<br /><br />The home side continued to press, with Mark Davies forcing a low save from Tremmel, who then denied Petrov.<br /><br />Swansea, showing 10 changes to the side that lost at Sunderland, offered very little in response.<br /><br />But they thought they had taken the lead after 40 minutes when Wayne Routledge netted from six yards, but the assistant referee flagged for offside.<br /><br />Within three minutes Swansea were in front when Moore outmuscled David Wheater and clipped the ball over Bolton goalkeeper Adam Bogdan.<br /><br />The lead lasted barely three minutes, as Pratley equalised in the final moments of the first half.<br /><br />Pratley, who left the Liberty Stadium last summer, headed home from close range and, in a show of respect to his former team, celebrated in subdued fashion.<br /><br />Moore went close to restoring Swansea's lead early in the second half when his long-range effort flew past the post.<br /><br />But Bolton went ahead in the 56th minute, with Eagles the first to react after Tremmel's error.<br /><br />Swansea's response was immediate as Leroy Lita hit the woodwork, while Pratley's header struck the crossbar at the other end and Nigel Reo-Coker found the side-netting with another Bolton effort.<br /><br />Swansea rallied in the final 10 minutes, captain Garry Monk going close before substitute Danny Graham head
