Hmm, I thought it was because Poland starts with some of the biggest cities (in a concentrated area) and you wanted to sack them.
There was also the great "Lithuanian army accidentally ambushes Novgorodan one" debacle. Armies in hiding will ambush "neutral" armies and if the ambush is successful you can't flee to avoid troop loss. We were about a turn from getting diplomats to eachother as well.
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