@ ShadowDuke - You can continue playing after Prologue 3 as that is the game I've been mistaking for being the campaign! I got a message that I could save after completing the objectives of Prologue 3 and that is what I've been playing since (right up the horrid bug I experienced which prevents me from progressing due to the enemy attacking me in Bovianum and all the Battle Deployment buttons being greyed out - see my post #232). I was still given objectives to complete - eliminate Samnites and take over Bovianum, which I had just done prior to the bug occuring - so I would say that the Prologue continuation was intentional. It's not like there wasn't any missions or anything like that to do. It appeared to be a structured campaign, albeit one where there were only two or three other factions not the dozens you see in the main campaign.