How the Messerschmitt Me 109 aircraft and M4 Sherman tank - two of the most produced combat machines in the Second World War - managed to stay relevant until the end of the conflict through constant modernisation and new variants.

How icons of the Royal Navy in different eras - the Belfast and the Harrier - have earned their place in history for different reasons.

The Vietnam war changed aerial warfare in more ways than one. The Phantom Cobra became the first true fighter bomber of the modern era.

This episode focuses on the Spitfire aircraft, which symbolised British hope and resistance and the Tiger tank, which embodied German power.