Bob,
Been following (intermittently) so forgive me if someone has pointed you to this source before - and looks like some other, much better placed than I, such as Oliver and Tony (amongst others), are on the case for you and have primary sources.
However, this site does look to be:
* of interest
* replete with information
* well researched / sourced and
* well presented
http://frederic.berjaud.free.fr/1eleger.htm
Legros, 3e bataillon, 1e compagnie
Worth a look I think - clears up one or two misconceptions at the least
Best wishes
A