The Iron clinched their first away league win of the season with a solid victory over 10-man Gillingham.
The Gills had skipper Doug Loft off for a two-footed challenge on Luke O’Neill before the break.
United, who were being run by Andy Dawson following Russ Wilcox’s departure, went 1-0 up through Paddy Madden.
New boss Mark Robins, who has agreed to take over United’s vacant managerial reins, watched from the stands as Neal Bishop and Gary McSheffrey added the other goals to seal Scunthorpe’s first away win since April.