First to fight- shedding a large light on the German - Polish, USSR-Polish war that started WWII, as a much overlooked theatre of war compared to the rest of WWII.
I went to a talk by the author at the BBC history magazine weekend in Chester last year, and promised myself I'd get the book in due course. Glad I did so far, as it debunks lots of "whig" history views like Cavalry vs tanks, and how much the UK and France didnt stick to their promises etc