I would, as one suggest that the super-large campaign isn't made. Better than to focus one of the smaller campaigns. Both for more details and that less research and possibly work before a finished mod is clear will be required.
Although there isn't as much information regarding that age's armies as say the Roman period of time there is suprisingly much about the larger factions. While smaller ones might not have as much one can usually know what weapons and types of unites were used in the area and piece together a good army list. Although possibly with demi-fantasy unites.
The Hitties were to my knowledge the first ones to use iron in greater quantity, most famously against the Egyptians and Ramses II in the Battle of Khadesh.
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