Steinheilper joined the Luftwaffe in 1936 and flew Me 109's during the battle of France and through the Battle of Britain.
A fascinating look at the Battle of Britain from the german point of view.
Steinhilper was a staffel mate of Adolph Galland and gives an unflattering portrait of Galland.
A excellent book one of my favorites!
1 attached image. Click to enlarge.