Luftwaffe in their raids on England had to deal with an active opposition flak anti-aircraft defense of England. This artillery was part of the ground forces (in the same way as in the British Expeditionary Force), although there was operationally, subject to Air Force Fighter Command. And although during the Battle of Britain was hit by flak relatively few German bombers, its action is largely hindered the flights of German bombers and, in any case, reduced the accuracy of the bombing. At the head of the air defense command was Lt. Gen. Pyle. He began his service in the artillery in 1923 was transferred to the armored forces, and soon became one of the most ardent fans of this kind of troops. However, in 1937, after assigning him the rank of Major General Pyle he was appointed commander of the 1st air defense artillery division which covered London and southern England areas. The next year, instead of two such divisions were created at first five, then seven. In late July, just before the start of the war, these divisions were consolidated into air defense command. Pyle was appointed commander. In his command were also searchlight units defending airfields and other important objects of attack low-flying aircraft.