Scott's dismay at cup exit
Marshall, recalled at full-back for the second-round tie, was dismissed for a second yellow card in the run-up to half-time, just minutes after Lewis Grabban had opened the scoring from the penalty spot.
The home side made the extra man count to win 2-1 with second-half strikes from Ian Sharps, against his old club, and Nicky Wroe, with a penalty eight minutes from time.
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Hide AdScott said: "The result didn't hang on the sending-off because we were 1-0 up at the time. The two goals they scored shouldn't have been goals. Conrad Logan was impeded for the first one and I don't think anyone expected the second one to be a penalty.
"Overall we were poor, especially in the first half when it was 11 v 11. We didn't play with the intensity and tempo we normally do and played too deep as a back four and allowed them too many chances to get the ball into the box.
"The goal gave us a lift but then we gave the ball away in a ridiculous area when we were on top with two or three minutes to half time. They counter-attacked and we got a man sent off and the game changed."
The Millers now face the prospect of yet another defensive reshuffle for Saturday's league trip to Hereford United after centre-half Guy Branston left the ground on crutches with an ankle injury.