I found a rather interesting book about The Franco-Prussian War by Klaus-Jurgen Bremm. I haven't finished it yet, but it is pretty good so far.
I am also asking for good literature about the 14th army in Burma, a multinational army fighting the Japanese and it was pretty successful as well
I have a couple on the Franco-Prussian War that I think are worth reading:
1. Franco Prussian War: The German Invasion of France, 1870-71- by Michael. Howard.
2. The Franco-Prussian War: The German Conquest of France in 1870-1871- by Geoffrey Wawro
3. A Duel of Giants: Bismarck, Napoleon III, and the Origins of the Franco-Prussian War Paperback – by David Wetzel.
The first is considered the standard text on the war in this part of the world, Howard's book compliments it fairly well, is an easier read but I think is a bit revisionist and Wetzel's book is an excellent book about the political causes of the war and a good insight into the early mindset that led to WW1 and WW2.
I haven't seen a copy of The Franco-Prussian War by Klaus-Jurgen Bremm that isn't in German and while I can read it, it would take about twice as long as the war for me to read and process it.
Two books on the 14th Army and the Burma campaign I would recommend are:
1. Fighting with the Fourteenth Army in Burma: Original War Summaries of the Battle Against Japan 1943–1945 - by James Luto
2. Military Economics, Culture and Logistics in the Burma Campaign, 1942-1945 by Graham Dunlop
I like understanding the logistics of campaigns so I found this book very useful.
another is BURMA '44 - by James Holland