Whenever a unit becomes obsolete because of new technology you have discovered, it is immediately replaced by an equivalent (though not veteran) modern unit. When you acquire a city by bribery, any remaining units that are obsolete for you get upgraded immediately.
Players with veteran pikemen (Civ2) (defense strength 6 against mounted units) may regret their replacement by non-veteran musketeers (Civ2) (strength 3)! That could be a reason for not going out of your way to discover Feudalism (Civ2) or build pikemen if you expect to get Gunpowder (Civ2) soon.
- Main article: Leonardo's Workshop (CivRev)
In Freeciv you get one unit upgraded per turn if any qualify, as long as the wonder is not obsoleted.
Leonardo's Workshop is not present in (or the article has not been created for) the following games :
|Civilization III||Leonardo's Workshop (Civ3)|
|Civilization IV||Leonardo's Workshop (Civ4)|
|Civilization V||Leonardo's Workshop (Civ5)|
|Civilization: Beyond Earth||Leonardo's Workshop (BE)|
|Civilization Revolution 2||Leonardo's Workshop (CivRev2)|
|Civilization: Call to Power||Leonardo's Workshop (CTP1)|
|Call to Power II||Leonardo's Workshop (CTP2)|
|C-evo||Leonardo's Workshop (C-evo)|
|Civilization IV: Colonization||Leonardo's Workshop (Civ IV: Colonization)|