Get a high level order wizard who knows the spell Possession (or a high level mage of any kind that has the Amulet Of Control). When entering battle, cast the Possession spell on any of enemy unit that is two levels lower than your mage. Before the battle ends, press the computer button. If you have won the battle, the possessed unit will still be there, but it has now joined your party. If you do not want to press the computer button, cast dispel magic on the possessed unit during or after the battle. With this trick you can get lords who already have taken their great temple (even Balkoth and also renegade only units such as the elephant. This also works with the "Walk Among Us" spell from death.