Twice in my game, my capital city just disappeared like the fall of Atlantis. The first time I thought perhaps I was too far away and just didn't see the roving monster conquer my city. I just happened to have a pioneer nearby so I sent it back to the original site and rebuilt the city. I made sure I stayed close by the city until after I had two spearmen built to garrison the city. Then I went off adventuring again. Then a few turns later, I looked over and saw the city gone again. My two stacks of spearmen were standing mutely by.
The second time the city disappeared, I'm fairly certain it wasn't attacked. I never had any battles for the city at all. I would think I would have at least been offered a battle to fight in either case. Surely a city would have at least one militia unit by default that would grab pitch forks and scythes to defend their homes. Surely this is a bug.
Has anyone else experienced this?