Navy versus Airforce in North Sea battle . The greatest mimic sea and air ' battle ' ever organised in Britain , took place off the coast of Scotland . Over 140 aeroplanes of eleven types , flying boats , battleships , aircraft carriers , cruisers and destroyers took part . Photo shows ; , aircraft of No 40 squadron using the clouds as cover in readiness to bomb ' enemy ' ships . September 1933 30s, 30's, 1930s, 1930's, thirties, nineteen thirties