by Maj. Gen. F.W. von Mellenthin
This is a nice find at the local used book store. Panzer Battles is the wartime memoirs of Major General Friedrich Wilhelm von Mellenthin. He served on the General Staff of the German Heer (Army) in World War II. Along the way, he saw the invasions of Poland and France in 1939 and 1940. He also served on Rommel's staff in the DAK (Afrika Korps). That is as far as I have read so far, but the book is giving a fascinating study of armoured warfare and staff work in the Second World War.
I highly recommend it if you are interested in tanks, military history, or World War II.