Thanks for your response Steve. I have only come across the book recently while surfing the internet. Unfortunately, I do not have a copy. Since, I have a Serbian background I can give you a decent translation of the Croatian description of La Croatie Militaire.
French officer and military historian Paul Boppe (1850-1916) is the only researcher in French histography who specialised in the field of Croatian Border Regiments Napoleon's army. He systematically based his work on archival sources. Boppe's only counterpart would be Drago Roksandic. The first section of the book deals with "Military Croatia." Military Croatia was organised under French rule as six regiments south of the Sava River and was in existance from 1809 to 1813. Boppe focuses on Croatian regiments in the Grande Armee in the latter half of the book. The publisher has remained true to the original text, with only a few minor corrections. Readers will benefit from the following contributions: an introduction from Drago Roksandic, a commentary by Vladimir Brndaric, a lexicon, a chronology of events during the various Coalitions, and a table comparing military ranks. the book contains ten colour illustrations by Zvonimir Grbasic, especially created for this edition. Six colour drawings by E. Malaspi from the original edition beautifully illustrate military uniforms and equipment.
The late Gunther Rothenberg also wrote two works on the Croatian/Krajina Military Border while it was part of Austria. Unfortunatley, his books are very hard to come by and have been out of print for approximatley fifty years. Hopefully, an enlightened publisher will make his classics more available.
I have a special interest in the military frontier region because my familiy like many Serbs, lived there for centuries until quite recently.