[Taqwus]

....1......
...........
...........front
...........towards
...........enemy
C.9........

1: sacrificial decoy; attack rear, obj:
draw fire, more importantly lure HI towards the 'wrong' flank hoping they're not on 'guard commander' (in which case you're hosed anyway) to reduce risk of HI blocking group-9

9: attack rear; obj: kill; the reason 9 are in one group is to minimize risk of routing when they take losses; doubt there's enough to split into three groups or more evenly without major morale risk

Considered hold/attack for g-9 but there's a fair chance the singleton is killed during the hold phase, methinks.

I'd consider the odds fairly poor, in so far as a few lucky hits by Xbows might cause a rout, but for the same reason I'd be reluctant to split groups more evenly -- at least one group has to close the distance to have a chance.