According to Riddle, the Basilisk attacked several students when the Chamber of Secrets was opened for the first time.
In my fifth year, the Chamber was opened and the monster attacked several students, finally killing one. I caught the person who'd opened the Chamber and he was expelled.
(Chamber of Secrets, Chapter 13, The Very Secret Diary).
Re-reading this came as a surprise to me as I'd always thought that Moaning Myrtle was the first and only victim. Yet Riddle says quite clearly that there were several attacks.
We know that large parts of Riddle's story in the diary are purposefully misleading at best and pure fiction at worst. His account isn't trustworthy. But is this nugget?
Was Riddle lying when he said that there were several attacks or was Myrtle the only victim?
I'm only interested in book answers relating to the first time the Chamber was opened (in the 1940s) please.