build diffrent bases across and menouvere, high ground is usefull, use the AI's dumb building systems to harass from diffrent location advantages, use horsemen and archers and swordsmen and battling machines to over beat ad magic army, use archmages and drake bandits and mages and dragons and summoners to outmatch the bravery and strength of the tech's national army.
catapults is something i am not experienced with, my knowledge has reached that they got destroyed very quickly in a light raid, i have not used them in a siege,
use blitzkreig, it brings your army to an amazing effectivness
garrison ranged units inside buildings to gain very effective defensive bonuses
use flights as a first wave of attack to cause confusion,
hit the enemy's economy, they will suffer badly from a loss in industry and productions and building...
build outposts outside enemy bases to launch a long siege, the enemy supply will suffer, but both sides will be suffering from attriton damage so watch out!
outrace the enemy's industry gives a huge advantage to you
cheers!!!
