Calculating attack rating of an army with craft weapons

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What is the formula that determines how craft weapons affect the total attack of an army when commanders or troops are equipped with them?
Why do none of the online battle calculators take craft weapons into account?
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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Somchai Kongkamsri, Pixabay, Pixabay, Rene Asmussen