Question re: Snape and James

[kchuplis]

No: HPFGUIDX 143996

I'm rereading the books now and at the end of book 1 DD tells Harry that the reason 
Snape so detested James is because James saved Snape's life and that that "debt" is 
probably why Snape was concerned with  protecting Harry even while loathing him 
that first year. I cannot remember this being returned to in any of the books. In posts 
I see people referring to the memory of James bullying Snape.  Did we find out how 
James saved Snape's life? 

kchuplis