How should I develop my units to defeat a Knight?

To be honest, mish-gun, I trained 103 Isabellas against 92 Banshees, but Axel really impressed me with his diplomacy. He gathered half the map. I don't know if you played that well, but as a result, the armies were almost equal. Maybe that was the reason for the defeat, and he also found a scroll with antimagic. I don't know what to do with it yet. Still, it's much better on the surface than in the Dungeon, and the artifacts are better too. True, I was playing two versus two. I also trained Retribution and Fallen Knight, which is also not bad (for a Knight).
P.S. Send the map again - LORDdeSat@yandex.ru