Pit Fiend
Delver Sergeant
Merchant Guard x2
Warhorse
Thrall of Blackrazor
Farmer

The Thrall mounts the horse (obviously), and gains assistance from the pit fiend. If the horse is killed to prevent the extra charging, the Pit Fiend can keep the horse alive for one extra turn (which could be what the Thrall needs to do an extra +10 damage on a charge). The Pit Fiend can also extend the life of the Merchant Guards if needed, or let the Thrall get an extra turn after its destroyed (and since it would be destroyed after taking damage, it had better not be a melee attack the opponent uses if they want to stop it from getting that extra turn).

The Delver Sergeant has alot of uses in this warband, it can do its usual activate 3 figures at once, or it can use the second power of the Pit Fiend and extend the life of another figure for another turn (such as giving the Pit Fiend another turn if its destroyed).

The Delver Sergeant could also use the first champion power of the Pit Fiend, to make the Pit Fiend explode for 15 damage if it is about to be killed.