I'm not having any success with massed (several units) cavalry.

I form up on high ground, , I wait, my infantry is engaged with the target. My cavalry strolls into the enemy. Sometimes. Sometimes they charge.

I've been reading on this in the forum, and it's a lot, and some is old, but is there a final verdict on the best way?

Is it better to use all the same kind of unit? Or do them individually?