Weird indeed. I checked the event, the McDonnel reinforcement should occur only once in all logic...but it could occur endlessly (which seems what you have) if a parameter in the event was changed by mistake (there is an event called evt_nam_Exile_count which grows by 1 each turn, when it is strictly equal to 3, Mc Donnell arrives...but if the parameter changed from = to >=, then you would have that)...so may your event is not right?
Try replace your event with this one
- 1812 Campaign.rar
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