Here is my after-action report. After turn 6 almost the whole map was Roman and no enemy appeared till the end of the game.
Forts sound too effective.
Thus when rebellion occurs, only 1 rebel milita is created. This sounds too easy. If there is at least one Roman militia point, place militia points as called for by the Revolution table, rather than flipping existing militias to their rebel side. I found that it was too easy to move leaders 1 area away from their big legion stacks during the second Roman Move Phase, to avert a rebellion. Or better, if you're honest, forbid yourself from using this trick.