In
the 1930s, Harry Watt had worked for Grierson's GPO Film Unit alongside
Humphrey Jennings, Alberto Cavalcanti and Basil Wright. Yet even in
his official documentary work Watt broke away from the conventional
documentary format and managed to introduce a narrative element - the
journey of the mail from London to Scotland (The Night Mail),
or the story of one voyage of a fishing boat in North Sea.
Filmed
on trains and trawlers, Watt portrayed real postal and railway workers
and trawlermen doing on film exactly what they did in real life and
using natural dialogue instead of the conventional 'voice over' narration.
In the first years of the war, Watt directed Squadron 992 - essentially
a film about air defence - Dover Front Line and Christmas
under Fire and worked with Jennings on London Can Take It
(1940), perhaps the most important and influential of the all the Blitz
films. Significantly, all these films were about ordinary people suffering
under enemy air attack but standing up to the worst the enemy could
do, indeed, even maintaining some semblance of 'normal' life under constant
attack. However, by late 1940, according to his autobiography, Watt
decided that it was time for a 'hitting back' film instead of 'taking
it' efforts. The RAF, he noted, were already starting to bomb Germany,
'so there was the obvious subject'. He approached the Ministry of Information
with his idea, the 'Ministry agreed wholeheartedly, and off I went to
see the Air Force Public Relations Officer, Wing-Commander Williams'.
The RAF agreed and Watt was commissioned to write and direct a film
based around the bombing of Germany. Pilot Officer Derek Twist (later
to head the RAF Film Unit) was provided as liaison officer and the filmmaker
was given unprecedented access to bombing reports and the RAF bomber
base at Mildenhall in Norfolk and the cooperation of RAF aircrew.17