League leaders Douglas went down 39-23 away at close rivals Crewe & Nantwich in South Lancashire/Cheshire Division Two.
Douglas raced into an early 15-0 lead with tries from Will Latta and Mike Hebden, plus a penalty and conversion from Bryn Snellgrove.
Crewe hit back, however, and were soon on level pegging.
Douglas leaked two soft tries at the back end of the first half and the teams turned around with Crewe 29-15 in front.
Will Latta added his second of the game after the break but Crewe were just two strong for Douglas and they bagged a converted try and a penalty to deny Douglas a losing bonus point.
Douglas dropped to third place in the table which is now headed by Oswestry.