None of the heavy cavalry that was existing on the map before the upgrade have upgraded.
I have been able to build the new improved model though.

Not sure if this has already been mentioned..... Playing as Britonae I have paid for the heavy cavalry upgrade. I can now build the new model, but the existing units in my armies have not upgraded at all. I have also paid for the heavy infantry upgrade. Is it WAD that the two types of Provincial Bri...