They already released the game as a half-finished utter mess except that the modding tools are too broken for anyone to fix anything.
A grave mound in Burkina Faso dated to about 1000 BCE contained an iron sword and 8 iron spearheads and another grave at the same site dated to 1300 BCE contained an iron spear. Furthermore there are irons objects found in Oboui in the Central African Republic indisputably carbon-dated to 2343 to 1900 BCE. These are just a few examples.
Only the 1st battalion was in Spain in 1813 and 1814 and that battalion had been transferred to the new 42nd regiment by August, 1814.