In 1956 the Corporal missile had been adopted by the Royal Artillery as a battlefield tactical nuclear missile. This missile was liquid-fuelled, thus requiring a large convoy of support vehicles to prepare it slowly for launch. It also required continual command guidance in flight, yet only achieved relatively poor accuracy. Also in use within the Royal Artillery was the Honest John rocket. This was solid-fuelled and could be launched rapidly, but was unguided and had only short range. There was a clear requirement for a missile that would combine the range of the Corporal, the ease-of-use and rapid reaction of Honest John, and a new guidance system with higher accuracy.