Haven – “Something’s afoot” [Campaign 3 – Mission 1]

So! I completed the first mission. I started twice! I'm playing on "difficult". The first time, I played as a Warrior – the Orcs completely crushed me... I started as a Mage! I chose the skill "+6% to Light Magic". There was only one serious opponent, the human hero Maximus, who decimated my army! And that was it! In the dungeon, I had +398 archers and 78 unupgraded spearmen. The much-praised griffins, numbering 214, which were SUPPOSED to join me (center of the map), never joined! But no problem, I managed without them, and it was a complete success! I can't imagine how to complete it as a Warrior....