AOS Creeps AI Question

I'm needing an ai for my aos style map, i just need the creeps to protect/defend the allied hero when attacked. u know.. so that the creeps doesn't just ignore the hero's fights and some other reasons.

questions is:
should i put some triggers to do this or there's an easier way using a melee ai or something?

thank u

atctually the creep will protect the hero/allied hero while on attack-move order, did you try it out ?