Actually, according to Cooper this AM, that's exactly what they're doing, a phased withdrawal from the town, blowing the bridges over the river behind them. I didn't post it, because it's largely a diatribe against the West for providing too little, too late, and then against the ZSU generals...Also, if you know your artillery has less than 4 rounds/day, it might be best to withdraw some of them a bit, let them rest, and focus on supplying the arty you do have.
As for the infantry, "the poor bloody infantry," my advice would be, to quote Joshua Lawrence Chamberlain on Little Round Top, "We're going to have to be stubborn today."
(See, I said something nice about a Yankee).