We are clearing out the neutral creatures.

I played a bit with the demons, but let their fans not criticize if the tactic seems simple. The point is that if the neutrals are slow and infantry-based, you just run around and attack with your hero. Against archers, it's better to quickly build units that can block them from the first or second turn without any problems – Cerberuses and Altgarde Demons, and it's also good to place a Succubus nearby. A Ballista can also help with this.