The only time I have been rather impressed with the diplomacy, and hence the strategic AI, was when I (HRE) launched a crusade against Danish held Stockholm (excommed).
My only friends (not allies though), the English joined up on the first turn (I was going to get Stockholm no matter what since I attacked from Sealand, the easternmost Danish island in the game). So their crusade is moving up Flanders.
The next turn I 'wake' to a huge English fleet blockading Århus. DAMN! Then I was officially at war with every faction I had a border with.
When I looked at the diplomatic relations I saw the Danes had managed to wrest a ceasefire from the English, and apparently convinced them to attack me.
I must say I was pissed off at first, but then the beauty of the intrigue of the Danish diplomacy took hold. They must have spent a lot of money to buy the English. But the result was that a major english army would be sitting deep deep in my territory when I captured Stockholm. No way I could stop such an army if it had decided to attack Frankfurt or some other city.
'Unfortunately' it chose to head back to Bruges... And so the English war stagnated into a cold war as with most of my enemies.
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