Unit order of attacking

I was playing Master of magic yesterday afternoon and something started to get on my nerves.

I had 3 flaying drakes one range hero and 3 shamans.

When I went into battle I would always want my range units to attack first in order to weaken the ennemy and then I would send in my mele to finish them off.

The game however always selected my mele first by default. I could choose a range attacker but then it would go back to my mele right after. So during each battle I would have to manually select my range units one after the other and then I would use my mele.

Now I know this is maybe just my play style but I would like if at all possible in this game, if we could tell the game how to select our units if such a selection will be made. Maybe the battles will be so different that this is not relevant but if it is, can I tell the game which units to select by default when a battle starts?

Exemple:

1-hero

2- range

3-mele

Something like that.

Thanks