He was released after some months of imprisonment, without trial, by the intervention of his friends.
Imprisonment was common, but is not recognized by the Code.
These prisons received all sentenced to short terms of imprisonment, the long-term convicts going to the bagnes (the great convict prisons at the arsenals of Rochefort, Brest and Toulon), while in 1851 transportation to penal colonies was adopted.
A royal decree, dated February 1891, established three classes of prisons: judiciary prisons, for persons awaiting examination or persons sentenced to arrest, detention or seclusion for less than six months; penitentiaries of various kinds (ergastoli, case di reclusione, detenzione or custodia), for criminals condemned to long terms of imprisonment; and reformatories, for criminals under age and vagabonds.
Auvergne after a few months' imprisonment was released, chiefly through the influence of his half-sister, his aunt, the duchess of Angouleme and his father-in-law.