However, it could have been so different if Ducks keeper Tim Garner had not made a great save from John Bailey's penalty in just the 3rd minute.
United eventually took the lead in the 39th minute when Steve Ketteridge sent over a free kick from the left and Peter Hutter evaded the Daggers defence to glance his header past keeper Dave Morgan from close range.
It was 2-0 in the 47th minute when Allan Pluckrose cut inside the left of the box to cross low from the byeline, Rob Smith's stabbed effort was well saved by Morgan but only half cleared by the defence and Simon Mason crossed back in from the right and Glenville Donegal fired high into the net from 6 yards for his 8th of the season.
It was 3-0 in the 63rd minute when junior Wilson's long free kick from the left into the box was flicked on by Cliff Hercules to Donegal who neatly took it down and, before the ball had dropped, lashed a volley past Morgan.
It was 4-0 in the 81st minute when Mason's through ball split the Daggers' defence to find Donegal who ran on before convincingly firing past Morgan to complete his hat-trick.
David Figg