Two tries at the beginning of second half, one from influential stand-off Scott Dyson, and a late brace from towering back-rower Liam Walmsley, saw Celtic close to within a point of Featherstone Lions in the race for the top six with a 28-18 win.
The low-scoring first half was dominated by the Lions but they failed to turn their pressure into points due to some excellent Celtic defence.
On virtually their first attack Dewsbury did find the line, a Josh West run and fine handling allowing Jack Millington to go over in the corner.
Danny Thomas pulled off a terrific try-saver on the marauding Smith after he had raced 35 metres while Dyson’s clever kicks in response kept turning the home side around.
Featherstone did open their account when Steve Coutts opened up the visiting defence and Smith supported from 30 out to power across for a deserved score.
Thomas defused a Jackson bomb and Millington had a good touchline run in reply, his chip being expertly read and picked off by Glassell as the side went in level at the break.
With coach Paul Heaton’s instructions ringing in their ears, Dewsbury made a flying tart to the second half, Dyson re-gathering his own chip to cross and Nikki Crabtree goaling.
Two sets of six later, Joe Diskin crossed to put the visitors in charge, Crabtree landing his second goal to make it 16-4.
A Coutts 40/20 gave Lions field position but with Thomas outstanding in defence, Celtic withstood a 15-minute pounding on their line, Smith, Jackson and Richard Frankland all going close.
Crabtree had a try disallowed for a forward pass in response before the hugely-impressive Walmsley took matters into his own hands.
The young forward proved unstoppable powering in for two tries in five minutes to secure victory for the visitors.
A last-ditch fightback from Lions earned them a point, however, Smith crossing for his second try after good work by Coutts and Thirling from a Jackson tilt ensuring, with Frankland’s goals – one from the touchline – that the final margin was below 12.

LIONS: Danny Glassell; Luke Beecher; Richard Frankland; Stu Davies; Carl Spencer; Adam Jones; Steve Coutts; Danny Richardson; Ian Jackson; Kyle Littlewood; Aaron Thirling; Craig Machen; John Smith. Subs: Nico Deville; Gareth Jones; Carl Vickers; Chris Walker.
Tries: Smith (36, 73), Thirling (76)
Goals: Frankland 3
CELTIC: Danny Thomas; Nikki Crabtree; Danny Crabtree; James Eatherley; Jack Millington; Scott Dyson; Josh West; Lee Wilkins; Mark Flynn; Elliot Smith; Liam Walmsley; Joe Diskin; Joe Waters. Subs (all used): Alex Walmsley; Ryan Ginnelly; Thomas Perks; Jake Richardson.
Tries: Millington (22), Dyson (44), Diskin (48), Walmsley (65, 70)
Goals: N Crabtree 4

MOTM: Liam Walmsley / Half time: 4-4 / Referee: Chris Waywell