If this is the documentary I think it is, it's not bad. It's a collage of German newsreel and combat footage in stark -- sometimes fuzzy -- black and white. It's always interesting to see the other side of a conflict -- what with so many documentaries and feature films available on the Battle of Britain, which in one sense the British won. The Germans interpreted it as a strategy that didn't work and so was discontinued. Besides, Hitler had always played Hamlet to Britain's Claudius, and when the invasion was called off, he turned his attention to Stalin in the East.
The first bombings by Germany were strictly strategic with a clear aim, the destruction of the radar sites along Britain's southern coast. But they were difficult to destroy and, entirely by accident, the bombing was switched to English cities. Coventry was a wake-up call. Even when I visited, in 1959, the London docks were a series of charred warehouse shells.
The day-time bombing became too costly and night bombing was substituted. It was effective in breaking British walls but not hearts, just as much later in the war a far more destructive bombing campaign would have the same effect on German cities.
Area bombing didn't work in Britain. It didn't work in Germany either. It hasn't worked since. Short of complete extermination it doesn't seem to work at all.