An anti tank gun is an artillery class unit. It costs 4ipp and attacks at a 2, and defends at a 4. It has a target select of 2 or less against vehicle class units, and may pair one to one with an infantry to give it a target select of +1 against vehicles. (if not in a city, then a target select of one, if in a city then two, if with heavy infantry then two, etc)
It may be upgraded to a self propelled anti tank gun for one IPP and then may move two spaces. All other stats are the same, except for self propelled anti tank gun pairs with mechanized or motorized infantry.