regarding the manual...
in the diplomacy section, I believe the system is overly complicated, and perhaps not entirely accurate. Based on my personal observations, the annexation coefficient is k=P*1.75+1 (where P is the hero's army strength, and 1 is a conditional value equal to the strength of 1 Peasant).
You can find more detailed information about diplomacy by following this link: http://www.e-pluribus-unum.heroesworld.ru/modules.php?name=Manuals
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