Sid Meier's Civilization is a turn-based strategy game that challenges players to build and expand an empire, throughout all of human history, and become the most powerful ruler in the world. Choose one of 18 nations to lead and go head to head with some of the most famous leaders in history.
Each civilization has its own special characteristics - some are fairly peaceful, while others are expansionists and conquerors. You'll battle your foes with a huge arsenal of weapons, beginning with primitive archers and warriors, then catapults, knights and frigates, and eventually with modern tanks, submarines, mobile infantry, helicopter gunships, stealth bombers, and nuclear weapons.
However, Civilization IV is more than just a great combat game: you can also achieve victory through diplomatic cunning, cultural or religious alliances, and technological dominance.
This is a SDK help file that will allow you to understand more about the units of Civilization IV.