Penguin freebie in UK only
Europe's Tragedy: A New History of the Thirty Years War is by
Peter H. Wilson
The horrific series of conflicts known as the Thirty Years War (1618-48) tore the heart out of Europe, killing perhaps a quarter of all Germans and laying waste to whole areas of Central Europe to such a degree that many towns and regions never recovered.
All the major European powers apart from Russia were heavily involved and, while each country started out with rational war aims, the fighting rapidly spiralled out of control, with great battles giving way to marauding bands of starving soldiers spreading plague and murder. The war was both a religious and a political one and it was this tangle of motives that made it impossible to stop. Whether motivated by idealism or cynicism, everyone drawn into the conflict was destroyed by it.
At its end a recognizably modern Europe had been created but at a terrible price.
http://www.amazon.co.uk/dp/B002TJLETG/