


Some are simple like Combat (5 levels), which gives progressive strength bonuses with some extra healing at the top levels, or City Raider/City Garrison which gives the unit bonuses only when attacking/defending a city. The promotions take on many different forms. As you might expect, the first promotion comes rather quickly, while each subsequent promotion requires more XP. In addition, some wonders, civic choices, and leader traits can give units extra experience or even certain promotions. Units can also gain experience from a Barracks (land units), a Drydock (sea units) or a goody hut. Successful combat is the primary means (note: you get more points from attacking than you do from defending) and the units must be victorious in a unit-to-unit combat, therefore there are no XPs (experience points) from bombarding fortifications or if the opposing unit withdraws. Here’s how it works: Units can gain experience points in several ways. The numbers and types of available bonuses differ per unit type and only land and sea military units can acquire them (air units are different). For Civ IV, we decided to build on this system and make promotions much more intricate and customizable by allowing players to choose from over 20 different bonus types (many with multiple levels, for a total of over 40 available promotions).
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