A Celestial Lions thread! \o/
Shame I can't offer any further information on the subject this time, though. As Korvis mentioned, 96 was the last number provided by GW - if you want to incorporate a Black Library novel that had them fight another battle after that incident into your interpretation of the setting, then I suppose you could only guess based on any casualties mentioned in that book as well as a certain amount of gut-feeling as to how many further losses they may have incurred that were not "narratively tracked" by that story.
Here's a backup of the Armageddon 3 campaign website with their article, though, if it's of any interest.
My own DW character is a Lion, too, and of course I've incorporated the incident on Armageddon in his backstory. It provides a neat motivation in "continueing the fight" in the name of his Chapter, as well as a secondary theme regarding the dark secret of who actually caused the Chapter to suffer this fate.
Edited by Lynata, 21 September 2013 - 04:26 PM.