During 1940, British engineers from the Petroleum Warfare Department, Lagonda and others worked on projects for the Cockatrice family of self-propelled flamethrowers. Two models of such equipment went into series and were used by the troops in order to protect airfields from a possible attack. By the end of the year, the authors of the projects decided to use the existing developments and ideas in new projects of self-propelled vehicles with increased mobility characteristics. The first successful example of this technique was named the Ronson flamethrower. Self-propelled flamethrower Ronson flamethrower (UK)