My favourite fighting style involves lots of cavalry and missile.

I will generalyy use fast cav to get rid of enemy missile units before they get in range.

Once done, I will then use my own missile units to soften the enemy line... and send in the heavy cav...

All you need to do is to time your cavalry charge just right... Which requires a bit of training but can be mastered rather easily...

I even managed to take on 1600 men with only two bodyguards, a Horse archer and a single unit of peasants as reinforcements...

There is nothing like cavalry in this game... Most times, I would not even take any infantry in my armies, not even in sieges (thanks to spies...)