Nice article in wikibedia en.wikipedia.org/wiki/Giulio_Gavotti
Just a couple things... Wikipedia did not know that Giulio could carry only three of those bombs in his suicase. The fourth was in the pocket of his leather jacket. These small bombs also came without users manual. They just knew that the bombs were to drop from plane. Without any practicing of bombing Giulio took off and after about 40 kilometers of flying he saw an enemy base. He tossed three of those bombs to the base (whitout any damage done to enemy) and fled saving the fouth bomb for target of opportunity.