Smith was pleased his half-time change had an impact in the win, with substitute Josh Sargent able to affect the contest with his energy and pressing.
The American was brought on in place of Todd Cantwell, who had been handed a first start in two months and was backed to get better by the former Aston Villa manager.
Smith said: “I thought it was worth the risk putting Todd into the team but I just felt he was a little off it and it is understandable.
“He hasn't trained with the group, I believe, for the last few weeks.
“Putting Sarg on, we got more legs onto the pitch, we could engage a lot higher up the pitch and we did that. I felt our eights never got to their sixes enough in the first half but when we changed it, I thought we were a much better team."
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