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 Byzantines kept it a closely guarded secret. The weapon was typically deployed using specialized siphons, which allowed defenders to spray the burning substance onto attackers. Its devastating impact helped the Byzantines defend their empire against various foes, including the Arabs and Seljuk Turks, and it played a crucial role in several key battles throughout history.