Grillo tried to carry torpedoes past harbor defenses

Italian frustration in the Adriatic produced a motor torpedo boat intended to overcome geography and defensive barriers rather than merely sail around them. Chain tracks were chosen from the technology that could be obtained and built quickly during the First World War. The goal was to cross harbor obstacles and carry torpedoes to Austro-Hungarian battleships that Italian attackers could see but not otherwise reach. The craft's slow speed and mechanical noise worked against the surprise required for a night attack. The same passage draws a broader institutional lesson: unresolved wartime frustrations can drive the next generation of doctrine and specialized equipment, as happened with the Royal Navy between the world wars. Grillo remains an early assault concept whose unrealized development raises the question of what Italy might have fielded by the Second World War.