While Segur is a worthwhile source - I sometimes wonder who well informed he was on some incidents, look for example what he wrote about the loss of the eagle of 1er Bat. 4e de Ligne at Austerlitz - running back, couldn't be rallied by Napoléon and still shouting Vive l'Empereur like automats and then compare to Biggaré who acutally commanded this outfit (and whose nominal commander was Joseph N)