Random move armies and casting sequence

[Herode]

Move orders are based on several things. If you look in the manual (p71-72 long list) you will see that, for example, moving to a friendly provinces goes first.

Yes, but what about symetrical situations ? The standard case is : my army in A attacks an ennemy province X. An ennemy army in Y attacks my army in A. Who moves first and why ?

I think the question has already been asked but I can't remember any clear answer. I also observe that on my current SP game where I an testing EA Abysia, I am always loosing p2p movement initiative vs Hinnom, Jotunheim & Mictlan. This is the case whatever the respective forces are : I can have bigger or smaller armies, doesn't matter, Abysia always moves after his opponents in this game.

But why is that ? Is initiative dependant on the nation ?