WCs upgrade to knights. They cannot upgrade to horsemen.
Think about it: if you were one of the people in Firaxis, would you let WCs, which are equal in strength to horsemen, upgrade to horsemen?
When you upgrade one unit to another unit, the cost is calculated by multiplying the amount of extra shields necessary to build the superior unit by four (or by two if you have Leonardo's Workshop), which means that a WC would have had to be upgraded at the cost of 40 gold just so it will not have the single disadvantage of being a wheeled unit.
Think about it: if you were one of the people in Firaxis, would you let WCs, which are equal in strength to horsemen, upgrade to horsemen?
When you upgrade one unit to another unit, the cost is calculated by multiplying the amount of extra shields necessary to build the superior unit by four (or by two if you have Leonardo's Workshop), which means that a WC would have had to be upgraded at the cost of 40 gold just so it will not have the single disadvantage of being a wheeled unit.
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