I'm not sure if you've taken a look at this, Web, and maybe you are sick to death of reading me rave about it, but, for a while, there was a really good T2K PbP on RPGnet that involved an entire ad-hoc company from the 5th ID stranded behind the lines after the Battle of Kalisz. There were only ever about 10 player-run characters at any given time but there were scores of NPCs and the style of the game created more of a collaborative mini-novel than the more conventional PbP Twilight 2000 campaigns that seem to predominate. It's currently defunct but the archive is still out there and most of it makes for compelling reading. It never got to Krakow but there was some sophisticated cloak-and-dagger aspects to it and at least one open mutiny/fragging. Keeping the company together was always one of the themes of the campaign
Your post about a company-sized unit and all of the difficulties concerning unit cohesion after receiving the "You're on your own" message reminded me of it. Here's a link to the portal. The IC archive can be found under S3 Operations.
http://www.d20.demon.nl/t2k/
I'd really like to run or play in something like this again but I'm not sure I can pull it off. The guy that created and ran it (and played many of the NPCs) was a Dutchman with an amazing command of the English language and the working of the U.S. military. Cool guy but his interest waned and he let it die. For that, I am still trying to forgive him.