I dont know if you would call this a bug or a feature
I had an army besieging Alsace-Lorraine having decided to end the interminable (and non-eventful) 'wars' with Hannover and that was their last province.
During the AI turn,they sallied out with a full stack and retreated back into the city with 2 units - however the siege continued.
During the same AI turn, moments later, a small army of Hessens who I was not at war with and had reciprocal miliary access with, walked up and took the city !!!
Never saw that happen before - all I got was a 'Siege lifted' voice and at the beginning of my turn there was my army standing there looking stunned
As I had given Hessen Flanders and the UP (which I had earlier conquered and given to Westphalia - and then took again after that same interminable and non-eventful 'war) I was not amused (well I was but my government wouldn't be ) so I attacked them (not allies) and took all four of their provinces in two turns.
The other thing then was that my friendly relations with Spain, Austria, Prussia etc suddenly turned hostile and it was because I had 'broken treaties' - the only treaty I had was military access and I cancelled that before declaring war on Hessen so seemed a big hit for nothing ??
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