I would say we'd want to have the Moonchasers start out killing Incorporeal dead with their cannons on the left flank, while the Manticores use explosive shells to try to take out the Charioteers on the right.
I would, at a guess, peg that we should focus our Servitors' Sunburst spells all along the center to really hammer that mist and get rid of it, but I couldn't guess at the most optimal means to remove it from play. Guessing
@Goldfish would know more.
I would place the minor PCs, Arcanums, Fey, et al on the left flank. That combined with the Moonchasers sniping all the ghosts should allow a breakthrough for the cavalry I would place there, with some held in reserve.
We probably want to consider extreme measures to ward off the charioteers closing enough to explode on our troops, though I guess we could just put an overwhelmingly strong force on that side who can blow them up at range.