But but... you distinctly said it wasn't possible without SEVERAL +leadership items and kiting...
I should also mention the reason I forgot about the helm is because I'm not even bothering to fill up my leadership with units. I did the last 10 fights or so with 1 troll, which is less than 1/3 the leadership I have for 1 stack. In fact, the only fight I couldn't pass so far is the dragon with the several thousand flies in that cave.