[quote=@Skallagrim]
Lol ok. Melees happen when combat happens. Formations break, individual combat becomes a melee.  Yes Melon, I know I agree. But Khan seems to think they never happened and no one broke ranks ir where over whelmed. Melees Khan happened.
[/quote]

I think it's fair for Khan to say that situations where melees could occur were avoided though, and anything avoided probably happened fairly rarely when life and death was concerned. 

Then again re-reading that post you quoted it does sound like Khan said melees were avoided within pitched battles, which I think was probably unlikely. Break down of command was pretty much a recurring theme in medieval combat. I can only think of a few battles off the top of my head, but all of them included what I would call a 'melee'. 

Hastings - Feigned Retreat/Bretons running like bitches causing the Saxon line to break and chase them.

Agincourt - Brutal maul between the English and French when they met at melee range after barraging them with arrows, people fell into the mud and drowned, people suffocated in armour, seems pretty messy.

The majority of the Crusade battles, even in siege the Crusaders were renowned for just killing everything.