The form diagramme was found in English. When it was first borrowed into English from French, this was done with people familiar with the French (obviously) and they used it as such. It is little surprise to find Webster's 1828 dictionary using diagram (and for that matter, epigram rather than epigramme). Interestingly for oriflamme he has not oriflam but oriflamb, introducing a different ...
“The NEX series of batons are already in use in 12 of the 16 German states,” said Jordan Brothers, Vice President of Sales & Marketing, NEXTORCH. “The NEX Batons are a favorite of police forces the ...