I tried playing again with the Warlocks, hoping to improve the Barbarians' result, but it didn't work – it took one more day. (and that's because they can't run as fast as Arghat) :smile48:. Ah, but with the Barbarians, by slightly improving the ending, I managed to save one day ;)
I didn't change the army, but instead went to capture the remaining two castles with what I had left (it worked, but it was close to a foul, and towards the end, I even had to surrender to the neutrals to have time to intercept the fleeing enemy hero). And the forces from the Warlock castle, along with a random hero hired in that same castle, were sent to capture the human castle.