I just got Mass Production and am now able to build battleships. Since the ironclad is a forerunner of the battleship, I thought that I could upgrade it. So I moved one of my ironclads three squares into a city with a coastal fortress but was not allowed to upgrade it. I have rubber and oil available as resources, by the way.
Is this correct? Do we have to build battleships from scratch?
Is this correct? Do we have to build battleships from scratch?
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