The Battle of Britain went on between July and October of 1940. During this time, how prepared was the German Eastern Front?
Specifically, how much of the German Army was on the West (either occupying France or waiting to invade Britain), versus how much guarding the East? How much of the Luftwaffe was busy with Britain, versus how much was guarding the East? Was the East Front fortified at all with trenches?
Or perhaps, was the east guard given mostly to the Italians?
BTW, at this time the Axis did not include Hungary, Romania, Yugoslavia, or Bulgaria. So the Eastern Front is relatively small at this point, running through Poland, and along Austria and Italy.
Edit: Another way of going about this is, how much of the Wermacht was occupying West Poland and Czechoslovakia at this time?