 Six more men were killed aboard the cruiser just two weeks before "Liberté" exploded, on 10 September 1911.The culprit was unstable "Poudre B", a nitrocellulose-based propellant that was also responsible for the destruction of "Iéna", and possibly the other explosions as well.Following the disaster, the navy established new rules, requiring that propellant charges older than four years would be discarded.