Yair, that's it. I don't trust the system to not crash half-way through a PBEM so I wouldn't totally recommend buying it if you don't have it already, unless you got some spare cash..
It's just the 1805 and 1809 campaigns along the Danube corridor. It's on Matrix games. Once battle is joined you can either ask the game to resolve it or export the OoB and fight the battle yourself then, apparently, feed back in the data to continue the campaign.