All
I am pretty certain that Pieter is correct
The lost/damaged Morane on 11.5.40 is 379 and NOT 679. Cne Vidal was lost in No 679 on 7.4.40
In which Morane Cne Hyvernaud was lost on 11.5.40 is still not settled.
In Bataille Aerienne 17(!) the same author has put a question mark after No 1012, which means he is uncertain. The Morane book quote No 946 as the one he was lost in (as does Mr Martin) while Bataille Aerienne 18 states No 946 was damaged by bombs on the 12th!
The problem I believe originates in that Cne Hyvernaud flow BOTH machines.
Bottom line is I have NO idea which one is which...
Cheers
Stig