The Ranger Encampment is a Colonial Age Military Building. It is where a player can train the Ranger, the light unit of the age. It is the second unlocked military building of the age. In order to construct the Ranger Encampment, a player needs to have unlocked the the Exploration technology. It is highly recommended to build the Ranger Encampment, as the Ranger has good and balanced stats for a light unit and also is the first unit in the game to have the special ability "Stealth in forests".
The Ranger is most effective against fast and ranged units. It gains defense in bushes and forests, just like past light units.
For more information about the military unit, visit the Ranger page.