Quick - Regular - Epic - Marathon
Improves Food Production and Gold by constructing Improvements on map tiles outside of Cities.
This unit constructs roads, railroads and builds improvements like farms and mines. It cannot defend itself, so accompany it with a military unit when it is in dangerous territory.
To survive, a civilization needs skilled workers. They may be highly trained engineers, or civilians conscripted into labor - or, indeed, slaves - but someone has to dig the mines, plant the fields and pave the roads. Without these men and women, a civilization will stagnate and eventually fall prey to a more vigorous neighbor.