if you go to the Civ4unitinfos.xml file find the gunship info and you need to edit the line <bCanMoveAllTerrain>1</bCanMoveAllTerrain> so that the number is a 1 and not a 0 u can also edit the line above aswell so that they can fly over mountains etc if you want them to do that or not. hope u find this post helpful and good luck