i have no i dea why but in every one i just get my cavalry to go round the back and since my cavalry is usually superior in either numbers or quality they don't even need to hide it is a simple formation
E
EEEE
EEEEEEE ccccc
IIIIIIIIIII
MMMM
also i always try to aim for the general every time because they seem to become absloutley devestated and runaway