Combat has accompanied mankind throughout the development of all civilizations, and it plays a major role in Civilization V. You may use combat as a way of achieving victory in the game (see Domination victory), or you can use it to simply enlarge your empire, or you can use it for a number of other reasons to improve the fortunes of your civilization. There are four major forms of combat: melee, ranged, naval, and air combat. The first three occur throughout most of the game, while air combat doesn't happen (naturally) until civilizations discover the technology for Flight.