Lewes recognized that existing explosives were inadequate for effectively damaging armored vehicles and aircraft. He identified the need for a more potent incendiary device.

Lewes experimented with various explosive mixtures and designs, eventually developing the Lewes Bomb, which contained plastic explosive, thermite, and petrol. He rigorously tested the bomb to ensure its reliability and effectiveness.

The Lewes Bomb became a standard weapon for the SAS in North Africa, enabling them to destroy enemy aircraft and vehicles with greater efficiency. Its effectiveness significantly contributed to the success of SAS raids.

The Lewes Bomb's design and principles influenced the development of later incendiary weapons. Its success highlighted the importance of innovation in military technology.