For more about the Battle of Égletons, see here:
http://www.ghostbombers.com/Bongart/GB_19.html
And a downloadable booklet (in French) here:
https://s4d09818f02ced15a.jimcontent...- egletons.pdf
I didn't know of any Bongart aircraft being shot down in this action but I have found a reference to an attacking aircraft being brought down by machine gun fire, killing "the two pilots" so I'll follow this up.