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Speaking to saddlers.co.uk, Smith said: “It was atrocious defending. At any level, if you give goals away like that, you will get walloped.
“We had an experienced back-line out there, but it was hard work and we gave ourselves a mountain to climb with our first half performance.
“It was massively frustrating, particularly after Saturday’s win, and the lads will come in on their day off tomorrow and we’ll have a look at it.
“Rochdale are a good team and have players in form, but you simply can’t give goals away like that.
“Yes, we’ve got injuries but that is no excuse for tonight’s display. As a defensive unit we were very poor and now we have to make sure that we learn from it and respond in the right way.”