Basically, in all the games, the presence of powerful artifacts on the winning side decided the outcome. :)
Kekc(order) def Havr(chaos) 1-0
I upgraded a Death Grand Master with Masscancel and a Chaos Grand Master. I had a halberd, and considering the Assassin and a Speed Potion, my hero moved faster than everyone else, except for the morale-boosting units. However, my opponent had a Ring of Constancy, and basically, my main strength was useless. :) And with sheer numbers, Order easily and effortlessly crushed Chaos.
Kekc(death) def Havr(nature) 2-0
I could have turned this battle around, but I messed up. I had a Sleigh, but my hero moved a bit too late. I should have hidden the Phoenixes, but instead, I rushed forward, removed the Immolation spell from the Necromancer, and after one hit from the Tactician, I lost 6 Phoenixes from Hand of Death. After that, I couldn't finish off the Tactician after emerging from the Sleigh; my opponent skillfully blocked the approaches to him, and I couldn't overwhelm him with a large group. And he calmly destroyed all my units.
Havr(might) def Kekc(chaos) 2-1
This time, I had the Ring of Constancy. Plus, I had the Book of Order, and I upgraded my Grand Master accordingly. Plus, the Barbarian-Tactician was given to Order, which I upgraded to Advanced under the second book. Against the numerical advantage and protection from Dispel Magic, Chaos could hardly do anything. Moreover, the situation turned out to be a mirror image of the first battle – this time, my opponent had a Death Grand Master with Masscancel. :)