Swordsmen are another resource hog are take high amount of Iron to build.
A swordsman is effective against Archers and but will not be effective against other troop types to that extend. However, the swordsmen are primarily defensive troops and they should be treated that way.
Pikemen are hogs for lumber. It costs a lot of this expensive resource to build them but they are most effective against Cavalry.
Warriors are the horde forces in this game. They are extremely inexpensive, build time is the quickest and are easy to feed.
As the name suggests, scouts are used for extracting intelligence. The Scouts will arrive at the enemy city and will provide detailed analysis of the enemy city.
In Evony Age 2 much like the Age 1, Workers are the mule. They have almost no fighting capability, are cheap and carry massive amounts of resources.
Archers is by far the most important and useful of all the unit types available in this game. They are economical, relatively quicker to build when you compare it to high damage mechanical troops and are light on the wallet.