I didn't completely eliminate anything, except for the Gremlins. Well, I don't count the Djinns.
Remaining: Titans are fully depleted, Nagas are 20, Mages are fully depleted, Golems are 80.
Basically, I didn't kill anything.
My main question is: logically, with equal armies and equal skills (and the attack of a Crag Hack equals the defense of any unit with a hero's defense), the attack should exceed the defense level, because expert defense gives 15% while attack gives 30%. The influence of a 5% increase in attack/defense affects the same modifiers, i.e., it affects both skills equally but in opposite ways.
Secondly, I attack first, so I'm met by a stack with fewer units – that's also an advantage. In the first turn, I destroy a larger part of the enemy army than they destroy of mine due to the response of my troops. Therefore, with equal armies and the first turn, I have an advantage in troop numbers.

Does anyone know how the ratio of expert attack/defense behaves in a real battle? I think I don't understand the game's math...