"In Honor of Our Fathers" – "The Hunter's Hunt" [Campaign 3, Mission 5]

probably the old posts were deleted, anyway - try starting with early saves (if you have them) - where not all secondary towns have been captured yet - give up one town (preferably the nearest one) to the enemy before the battle with Shahbadia - then the script will work correctly, but prepare properly beforehand (get the right artifacts, level up, and gather the necessary troops). There's a mentor nearby.