Regiment would be cool...over three or foru days..or Divisional but using reinforcements to build it up, say again over 4 days or so. You really see how the game works then more so than seeing a mass of counters all over the map.
Think this is more of a map making issue. Since there´s no off map artillery in the game, maps need to be very wide to provide space for artillery (and base) deployments. I´d ecpect to add 4-8 extra km left/right (or up/down)from the MLR to yield that.
Assuming a regimental size attack sector of between 3 to 5km max, a general deployment area for both sides forces of say...2 km depth, would demand a map size of about 3x15 to 5x20km minimum.
Edit: The BFTB Butgenbach map, would be a good example (it´s 6x16 km, divisional sized). Cut it down to about 3-5 km height and you´ve a regimental sized map, assuming units involved are framed by friendlies outside the map area. That would be the rule of thump, so to say, but off course depends upon particular battle to be simulated. I.e a regimental sized german kampfgruppe in russia, with exploitation mission, could be played on way larger maps. On the western front 1944/45, mostly the US would see deep exploitation type missions, with task force size forces.
< Message edited by RockinHarry -- 1/11/2013 4:05:10 PM >