QUESTION

ok... I was looking at my dates... and it says that on July 10, 1940 the Battle of Britain began... and that was when like Germany bombed them day after day after day after day after day after day sry... but then it says that on September of 1940 (2 months later) that Germany begins all out Blitz on Britain... CONFUSED!!! Can anyone explain that?? Or does anyone understand that??