The game was settled by a goal from Danny Rose in the 60th minute and saw former Sky Blue Craig Reid play for eighty minutes whilst former City young keeper Neil Collett was an unused substitute for The Stags.
Both sides finished with ten men in a match watched by a crowd of 2, 713.
City old boy Kevin MacDonald finished his spell as caretaker manager of Aston Villa with a 1-1 home draw against Bolton Wanderers. Stephen Warnock played for Villa.
Bas Savage made his Dagenham & Redbridge debut. The former Coventry trialist came on a 66th minute substitute in the 3-0 home defeat by Bristol Rovers.
Kevin Thornton scored for Northampton in a 3-1 defeat at Shrewsbury whilst Lee Hughes scored twice for Notts County in a 3-2 win against Leyton Orient.