Adolf Galland. The Legion Condor in the Spanish Civil war.
"The group 3j/88 it proves and uses in combat a called installation 'Egg of the devil'. That consists of leaning to the petrol tank ventral of the He 51 two bombs SC 10 and throwing in combat this set using it like an incendiary. On having impressed the deposit, the gasoline was scattering for a surface of 100 m2 and was catching fire after the explosion of the attached bombs."
Also they used home-made napalm adding to the gasoline oil of motorbike used in the same device, leaning a bomb SC 10 and an arsonist.
"The group 3j/88 it proves and uses in combat a called installation 'Egg of the devil'. That consists of leaning to the petrol tank ventral of the He 51 two bombs SC 10 and throwing in combat this set using it like an incendiary. On having impressed the deposit, the gasoline was scattering for a surface of 100 m2 and was catching fire after the explosion of the attached bombs."
Also they used home-made napalm adding to the gasoline oil of motorbike used in the same device, leaning a bomb SC 10 and an arsonist.