This is what admire about this mod project. The level of historical immersion that it will offer. For me in particular, the ability to reconstruct a truly historical 4th century Roman army in TW: ATTILA.
Here is a most excellent book that covers the period of Roman military history leading up to the start Judex Rex.
https://www.pen-and-sword.co.uk/Mili...ardback/p/4115
And the second volume that will cover the period 361-395 AD. Soon to be released in April.
https://www.pen-and-sword.co.uk/The-...ardback/p/6180
Russia seems to produce a unprecedented number of fanatical modders like the Judex Rex team. Who make Total war games still worth buying.