[Imp]

If you are not talking about going after his arty park but cutting off runners keep a small reserve behind main force. You can commit if you need to but the goal is as follows. Find the enemy engage him perhaps taking location into acount. Push forward only to close range so effective not to push back.
Now hold him even considering droping back everywhere except the weak spot which you hit with everything including the reserve. There job is to advance & when you judge it safe go round & cut off. If you think this will bring fire from guns further back smoke them out. If you have a reasonable amount of transport & face a large infantry force smoke to screen to a suitable size that means you can route most visible units & send transports in to unload adjacent preferably behind for rapid point blank destruction.