What happened at the Longbottoms?

[meriaugust]

No: HPFGUIDX 100184

I was pondering the character of Neville the other night (as a 
consequence of being out of school my mind has very much free time) 
and wondering what happened the night his parents (and possibly 
Neville himself) were tortured by the LeStranges and Barty Crouch 
for information about LV's whereabouts. I was wondering why there 
was so much confusion about what happened that night. I understand 
that poor Frank and Alice were in no condition to give any evidence 
against their attackers, but I am wondering how the Death Eaters 
themselves were caught. If they were caught in the act, say at the 
Longbottom's home, then the matter would have been very simple to 
clear up. Just Proir Incantatem their wands and see what pops out, 
right? But there seemed to be some doubts in GoF, especially 
regarding Barty Crouch's involvement. If they weren't found at the 
house, and Frank and Alice were too incapacitated then how were the 
Death Eaters ever caught? Could Neville, young as he was, have borne 
witness to his folks' torture and somehow had those memories 
retreived from his mind? Is a Pensieve usable on a baby? And could 
this, and not some mysterious memory charm, account for ever so 
forgetful Neville? Any theories about that fatefull night? Cause 
I've got nothing. 
Meri - who is determined to figure out Neville before JKR tells us 
everything...