It happens on the Seleucid turn. Nothing that I do seems to matter. Everything happens the same if I load a save game from turn 74 and end the turn twice.
I have a save game, but I cannot see how to upload it.
In any event, the campaign may be a lost cause. As Lugiones I am the most advanced faction and was the richest until I bought all the troops I can support. I am still outnumberd almoet 2 to 1 by the Boii, who have only a single city and are bankrupt.




