Greek fire was an incendiary weapon used by the Byzantine Empire, particularly during naval battles. It was a secret mixture that could ignite on contact with water, making it especially effective against enemy ships. The exact composition of Greek fire remains unknown, as the formula was closely guarded. The weapon was typically deployed using specialized siphons or tubes, allowing defenders to spray the burning substance onto attackers. Its psychological impact was significant, as the flames could not be easily extinguished, leading to fear and chaos among enemy forces. Greek fire played a crucial role in several key battles throughout Byzantine history.