:* If you get hit, you can start "hurting". That means you move slower.
:* Armor slows down the wearer. Heavier armor also slows down the attack speed so light armor like leather has a lower attack speed penalty then steel which slows down your attack speed considerably.
:* Bigger numbers matter. There is a bonus for having others fighting with you against an opponent. Gang up on people. Also, if multiple people start to attack you, its best to try to get some of them off you.
:* There is a bonus to hit from the side or back. If your out numbered, face your strongest opponent. If you outnumber them, surround them. Especially animals, as they turn constantly when surrounded.
:* Moving while fighting gives a penalty to the hit odds of the moving person, and a big penalty to the parry odds.