I'm CSA in the 1861 grand campaign. I garrison Manassas and eventually pay the costs for a fort. But because it takes more than 15 days it isn't completed in one turn. After I pay the costs my opponent moves into the area. I don't recall any battles that occurred that turn, but I didn't see a need to retreat as I had a depot there and plenty of supplies. I was also hoping the fort would be completed the next turn. Instead, the next turn resolution includes a statement that all three of my fully supplied divisions in Manassas, along with their corps commander, have surrendered without a shot being fired. That's 41,000 troops and over a hundred VPs!!
I was adjacent to the area with the Army HQ, and some other miscellaneous combat units, so I can't imagine that there wasn't a legitimate retreat route if needed. But the most bizarre aspect of this event is that the whole force surrendered without a single shot being fired.
Has this happened to anyone else, and how do I know when it is a possibility? It obviously is a PBEM game-breaker if your main army can suddenly decide to surrender.
Norm