Plan.
Rangers deploy close to enemy in cover, to force them to be shot at.
Dire avengers act as screen for heroes. None of the characters can be touched by shooting, unless all the infantry are dead. If the infantry are dead, I'd cycle different characters to be the closest target to spread wounds around. Asurman gives everyone a 5++ who doesn't already have one.
List.
Battalion Detachment
Avatar
Maugan Ra
Dire Avengers x5
Dire Avengers x5
4x 5 Rangers
Supreme Command
Asurman (warlord)
Baharoth
Fugean
Jain Zar
Khandaras
7 Command points.