To Ur Is Human is a set of free wargames rules for Sumerian/Mesopotamian warfare. The game is designed to be played with 15mm figures on a grid.
WGR Ancients 7th Edition is available for free as a pdf download.
If you scroll down on the Lead Adventure thread at the link, you will find a simple set of free wargames rules and a skirmish scenario for Late Roman "Pulp" Adventure.
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