I am happy to report that I have been able to finish the Prologue. Following Senate missions to capture Tarquinii, Bovianum, Tarentum and Ravenna gave me enough popular support to get the "Chance for Power" message that allows me to attack or cancel the alliance with the other Roman factions. My forces were not well positioned for an immediate attack, so I used the troops in Ravenna to capture the Gaul settlement in Umbria while moving the army from Tarentum back to the north and building a third stack in Tarquinii. I did not use the opportunity to betray the Senate in the Senate in the open field when my southern force fought a battle with them against a sizeable force of rebels in central Italy. When I had positioned two stacks near Rome, I opened hostilities with an assassination attempt at one of the Senate's generals whose discovery had me outlawed. I immediately started to besiege the city. (I had a spy, but he didn't manage to get the gates open.) After beating back a relief force during the Senate's turn, I assaulted the city from three sides during the next round. The fight for the city was not exactly my finest hour. I had vastly superior numbers, but lost the larger part of them during the fight. Embarrassingly, a lot of my legionaries died trying to climb one of those stupid siege towers. At times, I was even afraid of losing, which of course made for an exciting battle. In the end, Rome was mine, and after quickly taken the Scipii's capital in Picenum, I spent several years recovering and regrouping. During the next phase, I conquered the last Italian province as well as Sicily, and, after another, shorter break, I finished by taking the three provinces on the eastern side of the Adriatic Sea. The faction scroll kept telling me that I still needed fourty-, later thirty-something provinces to win, but after taking the last province, I got a proper Victory Screen. It congratulated me on controlling everything from the glaciers to the deserts, so I suppose they just used the text from the big map.
Anyway, to answer my original question, it is in my experience possible to get enough popular support to attack the Senate and to win the Prologue by taking all provinces on the map. Only the display of the victory condition on the faction scroll is incorrect.
SpartanGlory1983, I used the expression "35-province-rule" to refer the rule that Omanes Alexandrapolites described in his first post in this thread: "It takes thirty-five provinces to result in a fall in Senate popularity ..." I am sure that this is correct for the Imperial Campaign. The problem is that the Prologue map only has twelve provinces, so I was speculating that there might be a different (lower) threshold for the Prologue. I am still unable to confirm that from my game because I was only outlawed after attacking the Senate myself. I am sorry about the confusion.
I am happy to see that the Prologue does work as a mini campaign. Once you are past the initial tutorial phase, the map of Italy offers a nice change of pace from the Imperial Campaign's map of Europe. I am aware however that my observations are not the same as those of other contributors, particularly Osmanes Alexandrapolites and mrdun, so there is still a bit of a puzzle to be solved here. Perhaps this is about the game version and it was not possible to win the Prologue under earlier versions which most veterans will have used to play the Prologue?
I am also still intrigued by the idea of using the purchase of provinces to "earn" the Senate's anger, but I will have to try that out some other time. For the moment, I will move on to another Imperial Campaign.
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