Town midfielder Jai Reason celebrated extending his loan with Cambridge into a second month by scoring his first career goal, a last-minute winner as the U's defeated Mansfield at the Abbey Stadium.
Reason stooped to head home in the final minute to complete a 2-1 victory after the Stags had gone in front in the first half.
Elsewhere in the Blue Square Premier, Kurt Robinson was in the Rushden side which beat Lewes 2-1.
Jordan Rhodes and Brentford stay top of League Two after a 1-0 victory over Barnet, while Chris Casement was left out of the Wycombe 16 as they lost 1-0 at Lincoln.
Liam Trotter was an unused sub for Scunthorpe as they lost 2-1 at Peterborough, while Dan Harding was again left out of the Reading 16 as they drew 2-2 at home to Charlton.