I`m working on a comic book about French in La Grande Guerre and currently I`m drawing a story about Hartmannswillerkopf. I wish to find out what French units were holding the line on 9th September 1915, when the German 14. Jäger Bn and Garde-Pioneer Batallion attacked with gas and flammenwerfers.
ANd where was the 28th BCA at the time?
Also accounts or maps of this action would be great, I`m trying to make the comic as accurate as possible

Regards,
Tuomas Koivurinne