Once I win a battle with ratio of 1:5. The enemy are rebel army who attack my army while passing their territory, their army are consist of Mamluks, Saracen militia, Turkish archer, and 2 Town militia. And my army: 1 unit of Sipahi horse archers.
The key of my success: speed, patience, and maneuver.
I know it's impossible to win the battle with just head on to the enemy. So I lure them to wander around the field, since most of them are infantry, they got exhausted easily. But that's not enough, I keep lure them to break their formation.
When the time come, I arrow-storm the Mamluks first, since they're the most powerful and dangerous, and the general is in there. I lure them far away so the others won't distract me. Once their number went down to 8, I charge, but unfortunately the Mamluks have very good morale, they won't route no matter what. But I still kill the general.
The next target is Turkish archers, they're dangerous with their composite bow. I charge to them, but still, they won't route untill their number hit 10.
At this point, my army got tired, so I take a rest far from the enemy.
The 3 next target are all spearmen, I can't just charge to them, unless it's a suicide mission. But fortunately I still have arrow left. Saracen militia is my next arrow-storm target, since it's nearly impossible to charge to them, especially when my army winded. So I arrow-storm them until I run out of arrow, then I charge and successfully route them.
My 2 last target are exhausted town mimilitiasall of them routed in one charge.
That's a long battle which needs much patience. But the result was sweet. The enemy lost all of their 295 men while I lost 27 (only 13 men survive).
The battle took place near Damascus (which in rebels possession). I try to pass my army from Acre to Baghdad. I don't know there's a large army stand near me. Maybe because my army is too small for them, so they're just attack me. But serve them right, it was devastating defeat for them. I invade Damascus a few turn later.