Ranger "Refugees" - [5th campaign, 1st mission]

Hmm... it's funny that if you make the main hero stand in the middle gate, the enemy runs to their castle and stands there without moving...

Now I'll start slaughtering creatures...

Added after 5 hours and 42 minutes
Still can't get the stone flower...

If I do it the way Alan suggests, after weakening the garrisons, the enemy takes 2 of them in one turn - the result is disastrous =(

I killed the Inferno creatures - it's useless...

Could buying a license solve the problem?
I rarely play... I'm just feeling nostalgic =))
It's still annoying...