I. 'THANKS TO THE NAVY.' The commentary outlines events leading to the despatch of the largest supply convoy yet to Malta under the command of Rear-Admiral Sir Philip Vian, who is shown posing for photographs on the deck of an unidentified Royal Navy vessel. Two merchant ships, presumably part of the Malta convoy, are shown steaming in formation. The commentary highlights the desperate Axis attempts to stop the convoy reaching its destination over footage of an enemy air attack on merchant shipping. The Royal Navy cruiser HMS Euryalus and attendant destroyers are visible on the horizon. Dark flak bursts and chains of anti-aircraft tracer fire fill the sky as a German Luftwaffe Junkers Ju 88 bomber aircraft overflies the convoy at height. The Royal Navy ships make smoke in an attempt to shield the convoy from the eyes of Luftwaffe bomb-aimers. A Royal Navy anti-aircraft gunner fires a 20mm Oerlikon cannon at an unseen target as bombs explode around the convoy. A Royal Navy rating leans up against a door marked "First Aid Post" and smokes a cigarette with evident enjoyment.

II. 'BOMBER COMMAND.' "First recorded pictures of an air sweep over German occupied France". The commentary points out that there have been over three hundred offensive sweeps by the Royal Air Force over enemy occupied Europe over scenes of RAF Bristol Blenheim Mk IV bomber aircraft flying over stacked cumuli clouds. Scores of 250lb bombs are transported by tractor across an airfield, past a chocked early production model Blenheim Mk IV (no Squadron codes visible). Members of the General Duties (flying) branch of the RAF arrive for an operations briefing given by a Wing Commander who stands on a raised dais with aircraft formation diagrams evident in the background. Ground crew load 250lb bombs by hand into the bomb bay of a Blenheim displaying a skull and crossbones motif and bombing tally on its fuselage. Blenheim aircraft are refuelled by petrol bowser as the ground crew stack boxes of .303-in machine gun ammunition. At the end of their briefing, the aircrew are transported to their aircraft by soft-skinned vehicle. The commentary states that "Zero hour has struck" over scenes of the RAF aircrew climbing into their aircraft. Bristol Blenheim Mk IV bombers of 18 Squadron RAF, take off and climb over the airfield perimeter. The commentary states that the aircraft are heading for an area of Britain's South East coast known during the Battle of Britain as "Hell Fire Corner". Air to air footage of 18 Squadron aircraft in flight formation (Squadron code WV). The escort arrives in the form of a wing of Supermarine Spitfire Mk II fighter aircraft (36 aircraft) flying in loose formation. The commentary highlights the various tactics of the formation flying as the Blenheims reach the French coast. The Spitfire fighter escort climbs to gain a height advantage over possible adversaries. Bristol Blenheim Mk IV bombers of 82 Squadron RAF make a steep dive through cloud to attack an unseen target (Squadron code UX). A stock shot of an RAF bomb-aimer crouched over his bombsight follows. Bristol Blenheim Mk IV bombers maintain their altitude and direction despite numerous accurate flak bursts exploding around them. The commentary states that the escorting Spitfire aircraft make an attack on ground targets over camera gun footage of RAF attacks on shipping. A Hawker Hurricane IIc fighter aircraft makes an attack on a ground target firing its four 20mm wing cannons. A vic of three Blenheims of 82 Squadron RAF reform prior to a return to base. The Blenheims overfly a portion of the British coastline described by the commentary as "ramparts that have guarded the house of freedom for a thousand years". An RAF Volunteer Reserve Intelligence officer debriefs the Blenheim crews on their return from the mission and learns that a German Messerschmitt Bf 109 was downed into the sea by RAF Spitfires.