Byzantine Weapons and Warfare

[HHornblower]

Are there any references of Byzantine military activity in the Levant during the crusades? (Ie. were the Byzantines actively engaging saracen forces alongside the crusaders?) I cannot think of a reason why they would pass one of their most well-kept secrets along to the crusaders, so if greek fire handgrenades were used during the crusades, they would have been used by Byzantine soldiers.
This leads to another point of discussion. Even if only Byzantine elite soldiers were equipped with grenades filled with greek fire, it dramatically increases the probability that foes will either find ways to protect themselves or worse, capture a sample. It just isen't common sense to send your foot soldiers off with your most precious weapon as an allied force.

Regards,

HHornblower