Really, the autosave is intended to make a save when you quit the game and forget to save the current game. It really was just a fall-back in case the player clicked on the wrong button when quitting.
However, I have changed this to make an automatic save each turn right before you start your actual Campaign Phase. The game will still make an auto-save when shutting down if there is a current game in progress.
I hope that this will be more natural for the players. If you know the exact point where you want to save a game, you are better off making a manual save, since you won't overwrite it later with another .autosave.dat file.
In case anyone doesn't know, you can do a quick save with the F5 key and save the game as ".quicksave.dat" or you can use the "S" hot key and bring up a save dialog during a battle or on the game map. If the Roman player is moving on the game map you must pause the game first with the "P" hot key. The quick save will silently overwrite any previous .quicksave.dat file.
If you have a dialog open, such as the Help system, you must first close that before you can bring up the save dialog with the "S" hot key.
We should have the game's first patch available tomorrow (Tuesday the 28th).
Forced March Games, LLC