I said in the begin it will be against mordor, thats all i know sadly
and as far as i know he doesnt have moranon or black guard, most likely he will have a core army of orcs.
My only bet picking this army was to move gwaihir to 1 flank and keep hurling his supports, leaving a good part of his army 1v1.
Cavalry to move from the rear and also harassing his support aswell.
And for last outriders shooting from the opposite flank as gwaihir and once they have nothing to shoot at charge them aswell.
i wish rohirim had any kind of spears to support, then i would be more focused on numbers but i made this army to only outmaneuver and outshoot him, thats my only bet