Who was witness to the killing of James and Lily?

[elvishooked]

No: HPFGUIDX 42182

I have so many (stupid) questions - hoping somebody can clear up some 
of them for me ;-)
On the night that Voldemort killed James and Lily - who was actually 
present at the house to tell what really happened?
I dont recall having read of anyone except James, Lily, Harry and 
Voldemort being in the house when they were killed. So who actually 
TOLD the story of what happened?
How is it that everybody knows that Lily sacrificed her self to 
protect Harry? She and James died. Harry didnt remember anything and 
Voldemort "ran". Who told Dumbledore (and everyone else) what exactly 
went on in that house?

Inge