The secret of manufacturing the fluid was very carefully guarded, so well that today we still do not know how it was made.
Byzantine fire was largely responsible for many Byzantine military victories, and part of why the Empire managed to survive as long as it did, particularly near the end of the Empire when there were not enough inhabitatants of Byzantium to effectively defend it.
It was in a very general way similar to the modern flamethrower?. See also napalm for a flammable substance which has been used in modern warfare, notably the Vietnam War.
/Talk?