Unit

A Unit or Units are an individual or group of soldiers or civilians in the Age of Empires Series. Units are featured in all of the Age of Empire games as one of the important parts of the civilization. Each unit has his unique abilities and is good against other enemy troops. A combination of a few or many troops makes a good army in combat. Also, units can be created and produced in buildings, while a hero unit can only be given to you ahead of time in a scenario.

There are many types of units: civilian, military and animals.

Population Cap
Although a unit is seen on screen as only one in Age of Empires III many units actually represent a group of that unit. This theory is unimportant but may answer some small questions such as why only one civilian is needed to create a building or why a unit lives indefinitely until killed.