Front view of three German Do 17Z bombers in flight during the Battle of Britain.
Unknown author<span style="display: none;">Unknown author</span>
1940
Royal Air Force Battle of Britain campaign diaries <a rel="nofollow" class="external autonumber" href="http://www.raf.mod.uk/history/campaign_diaries.cfm?diarymonth=9&amp;diaryyear=1940">[1]</a> photo <a rel="nofollow" class="external autonumber" href="http://www.raf.mod.uk/rafcms/mediafiles/gallery/E6D79E61_5056_A318_A8391090E98E8E58/12sept(a).jpg">[2]</a>