The only common things were the size of the army (it was always more or less a full stack) and that it happened in enemy territory during war. Education and loyalty varied, but loyalty was always the highest available. Three full stacks is not the end of the world at the current stage of my campaign, it just makes fighting wars very frustrating. Distances between cities are massive in that part of the map and regions are poorly developed so it takes very long to train a new army and get them to the city where my previous army deserted.
To put it in perspective, I won the long campaign with Epeiros on the same difficulty (medium) doing everything the same way and I had only one traitor full stack throughout the campaign, even though I fought on pretty much every coast of the Mediterranean Sea.
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